diff --git a/lib/app_state.dart b/lib/app_state.dart
index 90fbb4f..317f4a7 100644
--- a/lib/app_state.dart
+++ b/lib/app_state.dart
@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart' show LatLngBounds;
+import 'package:url_launcher/url_launcher.dart';
 import 'services/http_client.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -20,10 +21,14 @@ import 'services/tile_preview_service.dart';
 import 'services/changelog_service.dart';
 import 'services/operator_profile_service.dart';
 import 'services/deep_link_service.dart';
+import 'services/auth_service.dart' show AccountBlockedException;
+import 'services/localization_service.dart';
 import 'widgets/node_provider_with_cache.dart';
 import 'services/profile_service.dart';
 import 'widgets/reauth_messages_dialog.dart';
+import 'widgets/active_block_dialog.dart';
 import 'dev_config.dart';
+import 'state/account_block_state.dart';
 import 'state/auth_state.dart';
 import 'state/messages_state.dart';
 import 'state/navigation_state.dart';
@@ -46,6 +51,7 @@ class AppState extends ChangeNotifier {
   static late AppState instance;
   
   // State modules
+  late final AccountBlockState _accountBlockState;
   late final AuthState _authState;
   late final MessagesState _messagesState;
   late final NavigationState _navigationState;
@@ -72,6 +78,7 @@ class AppState extends ChangeNotifier {
 
   AppState() {
     instance = this;
+    _accountBlockState = AccountBlockState();
     _authState = AuthState();
     _messagesState = MessagesState();
     _navigationState = NavigationState();
@@ -84,6 +91,7 @@ class AppState extends ChangeNotifier {
     _uploadQueueState = UploadQueueState();
     
     // Set up state change listeners
+    _accountBlockState.addListener(_onStateChanged);
     _authState.addListener(_onStateChanged);
     _messagesState.addListener(_onStateChanged);
     _navigationState.addListener(_onStateChanged);
@@ -179,6 +187,9 @@ class AppState extends ChangeNotifier {
   bool get hasUnreadChangesetComments => _messagesState.hasUnreadChangesetComments;
   bool get hasUnreadNotifications => _messagesState.hasUnreadNotifications;
   bool get isCheckingMessages => _messagesState.isChecking;
+
+  // Account block state
+  bool get hasActiveBlock => _accountBlockState.isBlocked;
   
   // Tile provider state
   List<TileProvider> get tileProviders => _settingsState.tileProviders;
@@ -196,6 +207,10 @@ class AppState extends ChangeNotifier {
   /// queue so in-flight submissions can finish first.
   bool get hasInFlightUploads => pendingUploads.any((u) => u.isActivelyProcessing);
 
+  /// True if queue processing is currently paused because an active-block
+  /// check found the user's account blocked.
+  bool get isQueuePausedDueToBlock => _uploadQueueState.isPausedDueToBlock;
+
 
   // Suspected location state
   SuspectedLocation? get selectedSuspectedLocation => _suspectedLocationState.selectedLocation;
@@ -245,15 +260,17 @@ class AppState extends ChangeNotifier {
     await _suspectedLocationState.init(offlineMode: _settingsState.offlineMode);
     await _uploadQueueState.init();
     await _authState.init(_settingsState.uploadMode);
+    await _accountBlockState.init(_settingsState.uploadMode);
     
     // Set up callback to repopulate pending nodes after cache clears
     NodeProviderWithCache.instance.setOnCacheClearedCallback(() {
       _uploadQueueState.repopulateCacheFromQueue();
     });
     
-    // Check for messages on app launch if user is already logged in
+    // Check for messages and active blocks on app launch if user is already logged in
     if (isLoggedIn) {
       checkMessages();
+      checkActiveBlock();
     }
     
     // Note: Re-auth check will be triggered from home screen after init
@@ -298,34 +315,131 @@ class AppState extends ChangeNotifier {
   }
 
   // ---------- Auth Methods ----------
-  Future<void> login() async {
-    await _authState.login();
-    // Check for messages after successful login
+  Future<void> login({BuildContext? context}) async {
+    try {
+      await _authState.login();
+    } catch (e) {
+      await _recordLoginFailure(e);
+      if (context == null || !context.mounted) return;
+      _showLoginFailureUi(e, context);
+      return;
+    }
+    // Check for messages and active blocks after successful login
     if (isLoggedIn) {
       checkMessages();
+      checkActiveBlock();
     }
   }
 
   Future<void> logout() async {
     await _authState.logout();
-    // Clear message state when logging out
+    // Clear message and block state when logging out
     clearMessages();
+    _accountBlockState.clear();
   }
 
   Future<void> refreshAuthState() async {
     await _authState.refreshAuthState();
   }
 
-  Future<void> forceLogin() async {
-    await _authState.forceLogin();
-    // Check for messages after successful login
+  Future<void> forceLogin({BuildContext? context}) async {
+    try {
+      await _authState.forceLogin();
+    } catch (e) {
+      await _recordLoginFailure(e);
+      if (context == null || !context.mounted) return;
+      _showLoginFailureUi(e, context);
+      return;
+    }
+    // Check for messages and active blocks after successful login
     if (isLoggedIn) {
       checkMessages();
+      checkActiveBlock();
     }
   }
 
-  Future<bool> validateToken() async {
-    return await _authState.validateToken();
+  /// Record any state changes resulting from a login/forceLogin failure.
+  /// Never touches the UI - safe to call before a BuildContext mounted check.
+  Future<void> _recordLoginFailure(Object error) async {
+    debugPrint('AppState: Login failed: $error');
+    if (error is AccountBlockedException) {
+      // We got a conclusive answer straight from the API during login, so
+      // record it like any other successful check.
+      await _accountBlockState.check(
+        accessToken: await _authState.getAccessToken(),
+        uploadMode: uploadMode,
+      );
+    }
+  }
+
+  /// Show the appropriate UI for a login/forceLogin failure. Callers must
+  /// check `context.mounted` immediately before calling this (no further
+  /// awaits in between) since it's used synchronously here.
+  void _showLoginFailureUi(Object error, BuildContext context) {
+    if (error is AccountBlockedException) {
+      _showActiveBlockDialog(context);
+      return;
+    }
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(LocalizationService.instance.t('auth.loginFailed')),
+        backgroundColor: Colors.red,
+      ),
+    );
+  }
+
+  // ---------- Account Block Methods ----------
+
+  /// Silently check whether the user currently has an active OSM block.
+  /// Returns the conclusive result (true/false), or null if the check was
+  /// inconclusive (offline, error, not logged in, simulate mode).
+  Future<bool?> checkActiveBlock() async {
+    final accessToken = await _authState.getAccessToken();
+    final result = await _accountBlockState.check(
+      accessToken: accessToken,
+      uploadMode: uploadMode,
+    );
+    // If the block was just lifted, resume queue processing.
+    if (result == false && isQueuePausedDueToBlock) {
+      _startUploader();
+    }
+    return result;
+  }
+
+  /// Check for an active block and, if found, show [ActiveBlockDialog].
+  Future<void> checkAndPromptForActiveBlock(BuildContext context) async {
+    final result = await checkActiveBlock();
+    if (result == true) {
+      if (!context.mounted) return;
+      _showActiveBlockDialog(context);
+    }
+  }
+
+  void _showActiveBlockDialog(BuildContext context) {
+    showDialog(
+      context: context,
+      builder: (context) => ActiveBlockDialog(
+        onViewDetails: () async {
+          final url = Uri.parse(getBlockDetailsUrl());
+          await launchUrl(url, mode: LaunchMode.externalApplication);
+        },
+        onDismiss: () {
+          // Just dismiss - will show again on the next check that finds a block.
+        },
+      ),
+    );
+  }
+
+  /// Test the OSM connection using the same endpoint as the active-block
+  /// check. A conclusive result (blocked or not) means the credentials are
+  /// valid; null means the connection/credentials failed. Also surfaces the
+  /// [ActiveBlockDialog] if the user turns out to be blocked.
+  Future<bool> testConnection(BuildContext context) async {
+    final result = await checkActiveBlock();
+    if (result == true) {
+      if (context.mounted) _showActiveBlockDialog(context);
+    }
+    return result != null;
   }
   
   // ---------- Messages Methods ----------
@@ -342,6 +456,18 @@ class AppState extends ChangeNotifier {
   String getMessagesUrl() {
     return _messagesState.getMessagesUrl(uploadMode);
   }
+
+  /// URL to view the current user's block details on OSM's website, or -
+  /// if the username isn't known for some reason - the messages inbox,
+  /// since OSM also sends a message when a block is issued.
+  String getBlockDetailsUrl() {
+    if (username.isEmpty) return getMessagesUrl();
+    final host = switch (uploadMode) {
+      UploadMode.sandbox => 'https://master.apis.dev.openstreetmap.org',
+      UploadMode.production || UploadMode.simulate => 'https://www.openstreetmap.org',
+    };
+    return '$host/user/${Uri.encodeComponent(username)}/blocks';
+  }
   
   /// URL of the specific changeset with unread comments, on OSM's website,
   /// or null if there are no unread changeset comments.
@@ -783,9 +909,12 @@ class AppState extends ChangeNotifier {
     
     // Clear and re-check messages for new mode
     clearMessages();
+    // Load the persisted block state for the new mode, then re-check it
+    await _accountBlockState.init(mode);
     if (isLoggedIn) {
       // Don't await - let it run in background
       checkMessages();
+      checkActiveBlock();
       
       // Note: Re-auth check will be triggered from the settings screen after mode change
     }
@@ -958,12 +1087,14 @@ class AppState extends ChangeNotifier {
       pauseQueueProcessing: pauseQueueProcessing,
       uploadMode: uploadMode,
       getAccessToken: _authState.getAccessToken,
+      checkActiveBlock: checkActiveBlock,
     );
   }
 
   @override
   void dispose() {
     _messageCheckTimer?.cancel();
+    _accountBlockState.removeListener(_onStateChanged);
     _authState.removeListener(_onStateChanged);
     _messagesState.removeListener(_onStateChanged);
     _navigationState.removeListener(_onStateChanged);
diff --git a/lib/dev_config.dart b/lib/dev_config.dart
index bf7f6ed..2b9eee9 100644
--- a/lib/dev_config.dart
+++ b/lib/dev_config.dart
@@ -49,6 +49,16 @@ double topPositionWithSafeArea(double baseTop, EdgeInsets safeArea) {
   return baseTop + safeArea.top;
 }
 
+// Whether to proactively check blocks/active *before* attempting to fetch
+// the username during login. Current OSM behavior: user/details returns 403
+// for blocked accounts, so we check blocks/active first (it's documented as
+// accessible even while blocked) to detect this reliably instead of getting
+// an unexplained 403. Flip to false once OSM allows user/details to succeed
+// for blocked accounts too, so login can complete normally and rely on the
+// regular checkActiveBlock() triggers (launch/resume/queue/test connection)
+// to surface the block warning instead.
+const bool kCheckBlockBeforeUsernameFetch = true;
+
 // Client name for OSM uploads ("created_by" tag)
 const String kClientName = 'DeFlock';
 // Note: Version is now dynamically retrieved from VersionService
diff --git a/lib/localizations/de.json b/lib/localizations/de.json
index b855799..9f27f6c 100644
--- a/lib/localizations/de.json
+++ b/lib/localizations/de.json
@@ -12,6 +12,7 @@
     "edit": "Bearbeiten",
     "delete": "Löschen",
     "cancel": "Abbrechen",
+    "dismiss": "Verwerfen",
     "ok": "OK",
     "close": "Schließen",
     "submit": "Senden",
@@ -124,6 +125,7 @@
     "deleteReasonCustom": "Benutzerdefiniert..",
     "deleteReasonHint": "Bitte Grund beschreiben...",
     "mustBeLoggedInToDelete": "Sie müssen mit einem OpenStreetMap-Konto angemeldet sein, um Kartendaten beizutragen.",
+    "accountBlockedCannotDelete": "Ihr OpenStreetMap-Konto ist derzeit gesperrt und kann keine Knoten löschen.",
     "uploadPending": "Ausstehender Upload",
     "uploadCreatingChangeset": "Changeset wird erstellt...",
     "uploadUploading": "Wird hochgeladen...",
@@ -140,6 +142,7 @@
     "direction": "Richtung  {}°",
     "profileNoDirectionInfo": "Dieses Profil benötigt keine Richtung.",
     "mustBeLoggedIn": "Sie müssen angemeldet sein, um neue Knoten zu übertragen. Bitte melden Sie sich über die Einstellungen an.",
+    "accountBlocked": "Ihr OpenStreetMap-Konto ist derzeit gesperrt und kann keine neuen Knoten einreichen.",
     "enableSubmittableProfile": "Aktivieren Sie ein übertragbares Profil in den Einstellungen, um neue Knoten zu übertragen.",
     "profileViewOnlyWarning": "Dieses Profil ist nur zum Anzeigen der Karte gedacht. Bitte wählen Sie ein übertragbares Profil aus, um neue Knoten zu übertragen.",
     "loadingAreaData": "Lade Bereichsdaten... Bitte warten Sie vor dem Übertragen.",
@@ -154,6 +157,7 @@
     "profileNoDirectionInfo": "Dieses Profil benötigt keine Richtung.",
     "temporarilyDisabled": "Bearbeitungen wurden vorübergehend deaktiviert, während wir einen Fehler beheben - Entschuldigung - schauen Sie bald wieder vorbei.",
     "mustBeLoggedIn": "Sie müssen angemeldet sein, um Knoten zu bearbeiten. Bitte melden Sie sich über die Einstellungen an.",
+    "accountBlocked": "Ihr OpenStreetMap-Konto ist derzeit gesperrt und kann keine Knoten bearbeiten.",
     "sandboxModeWarning": "Bearbeitungen von Produktionsknoten können nicht an die Sandbox übertragen werden. Wechseln Sie in den Produktionsmodus in den Einstellungen, um Knoten zu bearbeiten.",
     "enableSubmittableProfile": "Aktivieren Sie ein übertragbares Profil in den Einstellungen, um Knoten zu bearbeiten.",
     "profileViewOnlyWarning": "Dieses Profil ist nur zum Anzeigen der Karte gedacht. Bitte wählen Sie ein übertragbares Profil aus, um Knoten zu bearbeiten.",
@@ -210,6 +214,7 @@
     "tapToLogout": "Zum Abmelden antippen",
     "requiredToSubmit": "Erforderlich, um Kameradaten zu übertragen",
     "loggedOut": "Abgemeldet",
+    "loginFailed": "Anmeldung fehlgeschlagen. Bitte versuchen Sie es erneut.",
     "testConnection": "Verbindung Testen",
     "testConnectionSubtitle": "OSM-Anmeldedaten überprüfen",
     "connectionOK": "Verbindung OK - Anmeldedaten sind gültig",
@@ -241,7 +246,10 @@
     "reauthLater": "Später",
     "unreadNotificationsTitle": "Sie haben ungelesene Benachrichtigungen",
     "unreadNotificationsMessage": "Sie haben ungelesene OSM-Nachrichten und/oder neue Kommentare zu Ihren Changesets.",
-    "unreadNotificationsView": "Jetzt ansehen"
+    "unreadNotificationsView": "Jetzt ansehen",
+    "activeBlockTitle": "Ihr OSM-Konto hat eine aktive Sperre",
+    "activeBlockMessage": "Ihr OpenStreetMap-Konto ist derzeit gesperrt und kann keine Beiträge einreichen. Sie sollten eine Nachricht mit weiteren Details erhalten haben; bitte prüfen Sie Ihren OSM-Posteingang, um mehr zu erfahren.",
+    "viewBlockDetails": "Sperrdetails ansehen"
   },
   "queue": {
     "title": "Upload-Warteschlange",
@@ -277,6 +285,7 @@
     "processingPaused": "Warteschlangenverarbeitung pausiert",
     "pausedDueToOffline": "Upload-Verarbeitung ist pausiert, da der Offline-Modus aktiviert ist.",
     "pausedByUser": "Upload-Verarbeitung ist manuell pausiert.",
+    "pausedDueToBlock": "Die Upload-Verarbeitung ist pausiert, da Ihr OSM-Konto derzeit gesperrt ist.",
     "inFlightWaitTitle": "Übermittlung wird abgeschlossen",
     "inFlightWaitMessage": "Eine Übermittlung läuft gerade und muss abgeschlossen werden, bevor diese Einstellung angewendet werden kann. Dies sollte nur einen Moment dauern.",
     "inFlightCompleteTitle": "Übermittlung Abgeschlossen",
diff --git a/lib/localizations/en.json b/lib/localizations/en.json
index 36e915c..ce19b38 100644
--- a/lib/localizations/en.json
+++ b/lib/localizations/en.json
@@ -49,6 +49,7 @@
     "edit": "Edit",
     "delete": "Delete",
     "cancel": "Cancel",
+    "dismiss": "Dismiss",
     "ok": "OK",
     "close": "Close",
     "submit": "Submit",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Custom..",
     "deleteReasonHint": "Please describe the reason...",
     "mustBeLoggedInToDelete": "You must be logged in with an OpenStreetMap account to contribute map data.",
+    "accountBlockedCannotDelete": "Your OpenStreetMap account has an active block and cannot delete nodes.",
     "uploadPending": "Pending upload",
     "uploadCreatingChangeset": "Creating changeset...",
     "uploadUploading": "Uploading...",
@@ -177,6 +179,7 @@
     "direction": "Direction  {}°",
     "profileNoDirectionInfo": "This profile does not require a direction.",
     "mustBeLoggedIn": "You must be logged in to submit new nodes. Please log in via Settings.",
+    "accountBlocked": "Your OpenStreetMap account has an active block and cannot submit new nodes.",
     "enableSubmittableProfile": "Enable a submittable profile in Settings to submit new nodes.",
     "profileViewOnlyWarning": "This profile is for map viewing only. Please select a submittable profile to submit new nodes.",
     "loadingAreaData": "Loading area data... Please wait before submitting.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "This profile does not require a direction.",
     "temporarilyDisabled": "Edits have been temporarily disabled while we sort out a bug - apologies - check back soon.",
     "mustBeLoggedIn": "You must be logged in to edit nodes. Please log in via Settings.",
+    "accountBlocked": "Your OpenStreetMap account has an active block and cannot edit nodes.",
     "sandboxModeWarning": "Cannot submit edits on production nodes to sandbox. Switch to Production mode in Settings to edit nodes.",
     "enableSubmittableProfile": "Enable a submittable profile in Settings to edit nodes.",
     "profileViewOnlyWarning": "This profile is for map viewing only. Please select a submittable profile to edit nodes.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Tap to logout",
     "requiredToSubmit": "Required to submit camera data",
     "loggedOut": "Logged out",
+    "loginFailed": "Login failed. Please try again.",
     "testConnection": "Test Connection",
     "testConnectionSubtitle": "Verify OSM credentials are working",
     "connectionOK": "Connection OK - credentials are valid",
@@ -278,7 +283,10 @@
     "reauthLater": "Later",
     "unreadNotificationsTitle": "You Have Unread Notifications",
     "unreadNotificationsMessage": "You have unread OSM messages and/or new comments on your changesets.",
-    "unreadNotificationsView": "View Now"
+    "unreadNotificationsView": "View Now",
+    "activeBlockTitle": "Your OSM Account Has an Active Block",
+    "activeBlockMessage": "Your OpenStreetMap account currently has an active block and is restricted from making submissions. You should have received a message with more details; please check your OSM inbox to learn more.",
+    "viewBlockDetails": "View Block Details"
   },
   "queue": {
     "title": "Upload Queue",
@@ -314,6 +322,7 @@
     "processingPaused": "Queue Processing Paused",
     "pausedDueToOffline": "Upload processing is paused because offline mode is enabled.",
     "pausedByUser": "Upload processing is manually paused.",
+    "pausedDueToBlock": "Upload processing is paused because your OSM account has an active block.",
     "inFlightWaitTitle": "Finishing Submission",
     "inFlightWaitMessage": "A submission is currently in progress and needs to finish before this setting can be applied. This should only take a moment.",
     "inFlightCompleteTitle": "Submission Complete",
diff --git a/lib/localizations/es.json b/lib/localizations/es.json
index d4bc19d..01072c7 100644
--- a/lib/localizations/es.json
+++ b/lib/localizations/es.json
@@ -49,6 +49,7 @@
     "edit": "Editar",
     "delete": "Eliminar",
     "cancel": "Cancelar",
+    "dismiss": "Descartar",
     "ok": "Aceptar",
     "close": "Cerrar",
     "submit": "Enviar",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Personalizado..",
     "deleteReasonHint": "Por favor describa la razón...",
     "mustBeLoggedInToDelete": "Debes iniciar sesión con una cuenta de OpenStreetMap para contribuir con datos del mapa.",
+    "accountBlockedCannotDelete": "Su cuenta de OpenStreetMap tiene un bloqueo activo y no puede eliminar nodos.",
     "uploadPending": "Subida pendiente",
     "uploadCreatingChangeset": "Creando changeset...",
     "uploadUploading": "Subiendo...",
@@ -177,6 +179,7 @@
     "direction": "Dirección  {}°",
     "profileNoDirectionInfo": "Este perfil no requiere una dirección.",
     "mustBeLoggedIn": "Debe estar conectado para enviar nuevos nodos. Por favor, inicie sesión a través de Configuración.",
+    "accountBlocked": "Su cuenta de OpenStreetMap tiene un bloqueo activo y no puede enviar nodos nuevos.",
     "enableSubmittableProfile": "Habilite un perfil envíable en Configuración para enviar nuevos nodos.",
     "profileViewOnlyWarning": "Este perfil es solo para visualización del mapa. Por favor, seleccione un perfil envíable para enviar nuevos nodos.",
     "loadingAreaData": "Cargando datos del área... Por favor espere antes de enviar.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Este perfil no requiere una dirección.",
     "temporarilyDisabled": "Las ediciones han sido temporalmente deshabilitadas mientras solucionamos un error - disculpas - regrese pronto.",
     "mustBeLoggedIn": "Debe estar conectado para editar nodos. Por favor, inicie sesión a través de Configuración.",
+    "accountBlocked": "Su cuenta de OpenStreetMap tiene un bloqueo activo y no puede editar nodos.",
     "sandboxModeWarning": "No se pueden enviar ediciones de nodos de producción al sandbox. Cambie al modo Producción en Configuración para editar nodos.",
     "enableSubmittableProfile": "Habilite un perfil envíable en Configuración para editar nodos.",
     "profileViewOnlyWarning": "Este perfil es solo para visualización del mapa. Por favor, seleccione un perfil envíable para editar nodos.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Toque para cerrar sesión",
     "requiredToSubmit": "Requerido para enviar datos de cámaras",
     "loggedOut": "Sesión cerrada",
+    "loginFailed": "Error al iniciar sesión. Inténtelo de nuevo.",
     "testConnection": "Probar Conexión",
     "testConnectionSubtitle": "Verificar que las credenciales de OSM funcionen",
     "connectionOK": "Conexión OK - las credenciales son válidas",
@@ -278,7 +283,10 @@
     "reauthLater": "Más Tarde",
     "unreadNotificationsTitle": "Tienes Notificaciones Sin Leer",
     "unreadNotificationsMessage": "Tienes mensajes de OSM sin leer y/o nuevos comentarios en tus changesets.",
-    "unreadNotificationsView": "Ver Ahora"
+    "unreadNotificationsView": "Ver Ahora",
+    "activeBlockTitle": "Su cuenta de OSM tiene un bloqueo activo",
+    "activeBlockMessage": "Su cuenta de OpenStreetMap tiene actualmente un bloqueo activo y no puede realizar envíos. Debería haber recibido un mensaje con más detalles; revise su bandeja de entrada de OSM para obtener más información.",
+    "viewBlockDetails": "Ver Detalles del Bloqueo"
   },
   "queue": {
     "title": "Cola de Subida",
@@ -314,6 +322,7 @@
     "processingPaused": "Procesamiento de Cola Pausado",
     "pausedDueToOffline": "El procesamiento de subida está pausado porque el modo sin conexión está habilitado.",
     "pausedByUser": "El procesamiento de subida está pausado manualmente.",
+    "pausedDueToBlock": "El procesamiento de subidas está pausado porque su cuenta de OSM tiene un bloqueo activo.",
     "inFlightWaitTitle": "Finalizando Envío",
     "inFlightWaitMessage": "Actualmente hay un envío en curso que debe finalizar antes de que se pueda aplicar esta configuración. Esto solo debería tomar un momento.",
     "inFlightCompleteTitle": "Envío Completado",
diff --git a/lib/localizations/fr.json b/lib/localizations/fr.json
index 47bd605..9bea050 100644
--- a/lib/localizations/fr.json
+++ b/lib/localizations/fr.json
@@ -49,6 +49,7 @@
     "edit": "Modifier",
     "delete": "Supprimer",
     "cancel": "Annuler",
+    "dismiss": "Ignorer",
     "ok": "OK",
     "close": "Fermer",
     "submit": "Soumettre",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Personnalisé..",
     "deleteReasonHint": "Veuillez décrire la raison...",
     "mustBeLoggedInToDelete": "Vous devez être connecté avec un compte OpenStreetMap pour contribuer aux données cartographiques.",
+    "accountBlockedCannotDelete": "Votre compte OpenStreetMap a un blocage actif et ne peut pas supprimer de nœuds.",
     "uploadPending": "Téléchargement en attente",
     "uploadCreatingChangeset": "Création du changeset...",
     "uploadUploading": "Téléchargement en cours...",
@@ -177,6 +179,7 @@
     "direction": "Direction  {}°",
     "profileNoDirectionInfo": "Ce profil ne nécessite pas de direction.",
     "mustBeLoggedIn": "Vous devez être connecté pour soumettre de nouveaux nœuds. Veuillez vous connecter via les Paramètres.",
+    "accountBlocked": "Votre compte OpenStreetMap a un blocage actif et ne peut pas soumettre de nouveaux nœuds.",
     "enableSubmittableProfile": "Activez un profil soumissible dans les Paramètres pour soumettre de nouveaux nœuds.",
     "profileViewOnlyWarning": "Ce profil est uniquement pour la visualisation de la carte. Veuillez sélectionner un profil soumissible pour soumettre de nouveaux nœuds.",
     "loadingAreaData": "Chargement des données de zone... Veuillez patienter avant de soumettre.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Ce profil ne nécessite pas de direction.",
     "temporarilyDisabled": "Les modifications ont été temporairement désactivées pendant que nous résolvons un bug - désolés - revenez bientôt.",
     "mustBeLoggedIn": "Vous devez être connecté pour modifier les nœuds. Veuillez vous connecter via les Paramètres.",
+    "accountBlocked": "Votre compte OpenStreetMap a un blocage actif et ne peut pas modifier de nœuds.",
     "sandboxModeWarning": "Impossible de soumettre des modifications de nœuds de production au sandbox. Passez au mode Production dans les Paramètres pour modifier les nœuds.",
     "enableSubmittableProfile": "Activez un profil soumissible dans les Paramètres pour modifier les nœuds.",
     "profileViewOnlyWarning": "Ce profil est uniquement pour la visualisation de la carte. Veuillez sélectionner un profil soumissible pour modifier les nœuds.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Appuyer pour se déconnecter",
     "requiredToSubmit": "Requis pour soumettre des données de caméras",
     "loggedOut": "Déconnecté",
+    "loginFailed": "Échec de la connexion. Veuillez réessayer.",
     "testConnection": "Tester Connexion",
     "testConnectionSubtitle": "Vérifier que les identifiants OSM fonctionnent",
     "connectionOK": "Connexion OK - les identifiants sont valides",
@@ -278,7 +283,10 @@
     "reauthLater": "Plus Tard",
     "unreadNotificationsTitle": "Vous Avez des Notifications Non Lues",
     "unreadNotificationsMessage": "Vous avez des messages OSM non lus et/ou de nouveaux commentaires sur vos changesets.",
-    "unreadNotificationsView": "Voir Maintenant"
+    "unreadNotificationsView": "Voir Maintenant",
+    "activeBlockTitle": "Votre compte OSM a un blocage actif",
+    "activeBlockMessage": "Votre compte OpenStreetMap a actuellement un blocage actif et ne peut pas effectuer de soumissions. Vous devriez avoir reçu un message avec plus de détails ; veuillez consulter votre boîte de réception OSM pour en savoir plus.",
+    "viewBlockDetails": "Voir les Détails du Blocage"
   },
   "queue": {
     "title": "File de Téléchargement",
@@ -314,6 +322,7 @@
     "processingPaused": "Traitement de la File d'Attente Interrompu",
     "pausedDueToOffline": "Le traitement des téléversements est interrompu car le mode hors ligne est activé.",
     "pausedByUser": "Le traitement des téléversements est interrompu manuellement.",
+    "pausedDueToBlock": "Le traitement des envois est en pause car votre compte OSM a un blocage actif.",
     "inFlightWaitTitle": "Finalisation de la Soumission",
     "inFlightWaitMessage": "Une soumission est actuellement en cours et doit se terminer avant que ce paramètre puisse être appliqué. Cela ne devrait prendre qu'un instant.",
     "inFlightCompleteTitle": "Soumission Terminée",
diff --git a/lib/localizations/it.json b/lib/localizations/it.json
index 1a57865..891ff7a 100644
--- a/lib/localizations/it.json
+++ b/lib/localizations/it.json
@@ -49,6 +49,7 @@
     "edit": "Modifica",
     "delete": "Elimina",
     "cancel": "Annulla",
+    "dismiss": "Ignora",
     "ok": "OK",
     "close": "Chiudi",
     "submit": "Invia",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Personalizzato..",
     "deleteReasonHint": "Descrivi il motivo...",
     "mustBeLoggedInToDelete": "Devi aver effettuato l'accesso con un account OpenStreetMap per contribuire ai dati della mappa.",
+    "accountBlockedCannotDelete": "Il tuo account OpenStreetMap ha un blocco attivo e non può eliminare i nodi.",
     "uploadPending": "Caricamento in sospeso",
     "uploadCreatingChangeset": "Creazione changeset...",
     "uploadUploading": "Caricamento...",
@@ -177,6 +179,7 @@
     "direction": "Direzione  {}°",
     "profileNoDirectionInfo": "Questo profilo non richiede una direzione.",
     "mustBeLoggedIn": "Devi essere loggato per inviare nuovi nodi. Per favore accedi tramite Impostazioni.",
+    "accountBlocked": "Il tuo account OpenStreetMap ha un blocco attivo e non può inviare nuovi nodi.",
     "enableSubmittableProfile": "Abilita un profilo inviabile nelle Impostazioni per inviare nuovi nodi.",
     "profileViewOnlyWarning": "Questo profilo è solo per la visualizzazione della mappa. Per favore seleziona un profilo inviabile per inviare nuovi nodi.",
     "loadingAreaData": "Caricamento dati area... Per favore attendi prima di inviare.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Questo profilo non richiede una direzione.",
     "temporarilyDisabled": "Le modifiche sono state temporaneamente disabilitate mentre risolviamo un bug - scuse - torna presto.",
     "mustBeLoggedIn": "Devi essere loggato per modificare i nodi. Per favore accedi tramite Impostazioni.",
+    "accountBlocked": "Il tuo account OpenStreetMap ha un blocco attivo e non può modificare i nodi.",
     "sandboxModeWarning": "Impossibile inviare modifiche di nodi di produzione alla sandbox. Passa alla modalità Produzione nelle Impostazioni per modificare i nodi.",
     "enableSubmittableProfile": "Abilita un profilo inviabile nelle Impostazioni per modificare i nodi.",
     "profileViewOnlyWarning": "Questo profilo è solo per la visualizzazione della mappa. Per favore seleziona un profilo inviabile per modificare i nodi.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Tocca per disconnetterti",
     "requiredToSubmit": "Richiesto per inviare dati delle telecamere",
     "loggedOut": "Disconnesso",
+    "loginFailed": "Accesso non riuscito. Riprova.",
     "testConnection": "Testa Connessione",
     "testConnectionSubtitle": "Verifica che le credenziali OSM funzionino",
     "connectionOK": "Connessione OK - le credenziali sono valide",
@@ -278,7 +283,10 @@
     "reauthLater": "Più Tardi",
     "unreadNotificationsTitle": "Hai Notifiche Non Lette",
     "unreadNotificationsMessage": "Hai messaggi OSM non letti e/o nuovi commenti sui tuoi changeset.",
-    "unreadNotificationsView": "Visualizza Ora"
+    "unreadNotificationsView": "Visualizza Ora",
+    "activeBlockTitle": "Il tuo account OSM ha un blocco attivo",
+    "activeBlockMessage": "Il tuo account OpenStreetMap ha attualmente un blocco attivo e non può effettuare invii. Dovresti aver ricevuto un messaggio con maggiori dettagli; controlla la tua casella di posta OSM per saperne di più.",
+    "viewBlockDetails": "Visualizza Dettagli Blocco"
   },
   "queue": {
     "title": "Coda di Upload",
@@ -314,6 +322,7 @@
     "processingPaused": "Elaborazione Coda Sospesa",
     "pausedDueToOffline": "L'elaborazione dei caricamenti è sospesa perché la modalità offline è abilitata.",
     "pausedByUser": "L'elaborazione dei caricamenti è sospesa manualmente.",
+    "pausedDueToBlock": "L'elaborazione della coda di caricamento è in pausa perché il tuo account OSM ha un blocco attivo.",
     "inFlightWaitTitle": "Completamento Invio",
     "inFlightWaitMessage": "Un invio è attualmente in corso e deve terminare prima che questa impostazione possa essere applicata. Questo dovrebbe richiedere solo un momento.",
     "inFlightCompleteTitle": "Invio Completato",
diff --git a/lib/localizations/nl.json b/lib/localizations/nl.json
index 4a379bd..754c78d 100644
--- a/lib/localizations/nl.json
+++ b/lib/localizations/nl.json
@@ -49,6 +49,7 @@
     "edit": "Bewerken",
     "delete": "Verwijderen",
     "cancel": "Annuleren",
+    "dismiss": "Negeren",
     "ok": "OK",
     "close": "Sluiten",
     "submit": "Indienen",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Aangepast..",
     "deleteReasonHint": "Beschrijf de reden...",
     "mustBeLoggedInToDelete": "U moet ingelogd zijn met een OpenStreetMap-account om kaartgegevens bij te dragen.",
+    "accountBlockedCannotDelete": "Uw OpenStreetMap-account heeft een actieve blokkade en kan geen knooppunten verwijderen.",
     "uploadPending": "Upload in behandeling",
     "uploadCreatingChangeset": "Changeset maken...",
     "uploadUploading": "Uploaden...",
@@ -177,6 +179,7 @@
     "direction": "Richting  {}°",
     "profileNoDirectionInfo": "Dit profiel vereist geen richting.",
     "mustBeLoggedIn": "U moet ingelogd zijn om nieuwe nodes in te dienen. Log in via Instellingen.",
+    "accountBlocked": "Uw OpenStreetMap-account heeft een actieve blokkade en kan geen nieuwe knooppunten indienen.",
     "enableSubmittableProfile": "Schakel een indienbaar profiel in via Instellingen om nieuwe nodes in te dienen.",
     "profileViewOnlyWarning": "Dit profiel is alleen voor kaart weergave. Selecteer een indienbaar profiel om nieuwe nodes in te dienen.",
     "loadingAreaData": "Gebied gegevens laden... Wacht even voordat u indient.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Dit profiel vereist geen richting.",
     "temporarilyDisabled": "Bewerkingen zijn tijdelijk uitgeschakeld terwijl we een bug oplossen - excuses - controleer binnenkort opnieuw.",
     "mustBeLoggedIn": "U moet ingelogd zijn om nodes te bewerken. Log in via Instellingen.",
+    "accountBlocked": "Uw OpenStreetMap-account heeft een actieve blokkade en kan geen knooppunten bewerken.",
     "sandboxModeWarning": "Kan geen bewerkingen op productie nodes naar sandbox versturen. Schakel naar Productie modus in Instellingen om nodes te bewerken.",
     "enableSubmittableProfile": "Schakel een indienbaar profiel in via Instellingen om nodes te bewerken.",
     "profileViewOnlyWarning": "Dit profiel is alleen voor kaart weergave. Selecteer een indienbaar profiel om nodes te bewerken.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Tik om uit te loggen",
     "requiredToSubmit": "Vereist om camera gegevens in te dienen",
     "loggedOut": "Uitgelogd",
+    "loginFailed": "Inloggen mislukt. Probeer het opnieuw.",
     "testConnection": "Test Verbinding",
     "testConnectionSubtitle": "Verifieer dat OSM credentials werken",
     "connectionOK": "Verbinding OK - credentials zijn geldig",
@@ -278,7 +283,10 @@
     "reauthLater": "Later",
     "unreadNotificationsTitle": "U Heeft Ongelezen Meldingen",
     "unreadNotificationsMessage": "U heeft ongelezen OSM-berichten en/of nieuwe opmerkingen op uw changesets.",
-    "unreadNotificationsView": "Nu Bekijken"
+    "unreadNotificationsView": "Nu Bekijken",
+    "activeBlockTitle": "Uw OSM-account heeft een actieve blokkade",
+    "activeBlockMessage": "Uw OpenStreetMap-account heeft momenteel een actieve blokkade en kan geen inzendingen doen. U zou een bericht met meer details moeten hebben ontvangen; controleer uw OSM-inbox voor meer informatie.",
+    "viewBlockDetails": "Blokkadedetails Bekijken"
   },
   "queue": {
     "title": "Upload Wachtrij",
@@ -314,6 +322,7 @@
     "processingPaused": "Wachtrij Verwerking Gepauzeerd",
     "pausedDueToOffline": "Upload verwerking is gepauzeerd omdat offline modus is ingeschakeld.",
     "pausedByUser": "Upload verwerking is handmatig gepauzeerd.",
+    "pausedDueToBlock": "Het uploadproces is gepauzeerd omdat uw OSM-account een actieve blokkade heeft.",
     "inFlightWaitTitle": "Indiening Wordt Afgerond",
     "inFlightWaitMessage": "Er is momenteel een indiening bezig die moet worden afgerond voordat deze instelling kan worden toegepast. Dit zou maar een moment moeten duren.",
     "inFlightCompleteTitle": "Indiening Voltooid",
diff --git a/lib/localizations/pl.json b/lib/localizations/pl.json
index f7fb118..bf0e7a8 100644
--- a/lib/localizations/pl.json
+++ b/lib/localizations/pl.json
@@ -49,6 +49,7 @@
     "edit": "Edytuj",
     "delete": "Usuń",
     "cancel": "Anuluj",
+    "dismiss": "Odrzuć",
     "ok": "OK",
     "close": "Zamknij",
     "submit": "Zgłoś",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Niestandardowy..",
     "deleteReasonHint": "Opisz powód...",
     "mustBeLoggedInToDelete": "Musisz być zalogowany na konto OpenStreetMap, aby dodawać dane do mapy.",
+    "accountBlockedCannotDelete": "Twoje konto OpenStreetMap ma aktywną blokadę i nie może usuwać węzłów.",
     "uploadPending": "Przesyłanie oczekujące",
     "uploadCreatingChangeset": "Tworzenie zestawu zmian...",
     "uploadUploading": "Przesyłanie...",
@@ -177,6 +179,7 @@
     "direction": "Kierunek  {}°",
     "profileNoDirectionInfo": "Ten profil nie wymaga kierunku.",
     "mustBeLoggedIn": "Musisz być zalogowany, aby zgłaszać nowe węzły. Zaloguj się przez Ustawienia.",
+    "accountBlocked": "Twoje konto OpenStreetMap ma aktywną blokadę i nie może zgłaszać nowych węzłów.",
     "enableSubmittableProfile": "Włącz profil możliwy do zgłoszenia w Ustawieniach, aby zgłaszać nowe węzły.",
     "profileViewOnlyWarning": "Ten profil służy tylko do przeglądania mapy. Proszę wybrać profil możliwy do zgłoszenia, aby zgłaszać nowe węzły.",
     "loadingAreaData": "Ładowanie danych obszaru... Poczekaj przed zgłoszeniem.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Ten profil nie wymaga kierunku.",
     "temporarilyDisabled": "Edycje zostały tymczasowo wyłączone, gdy rozwiązujemy błąd - przepraszamy - sprawdź wkrótce.",
     "mustBeLoggedIn": "Musisz być zalogowany, aby edytować węzły. Zaloguj się przez Ustawienia.",
+    "accountBlocked": "Twoje konto OpenStreetMap ma aktywną blokadę i nie może edytować węzłów.",
     "sandboxModeWarning": "Nie można przesyłać edycji węzłów produkcyjnych do piaskownicy. Przełącz na tryb Produkcyjny w Ustawieniach, aby edytować węzły.",
     "enableSubmittableProfile": "Włącz profil możliwy do zgłoszenia w Ustawieniach, aby edytować węzły.",
     "profileViewOnlyWarning": "Ten profil służy tylko do przeglądania mapy. Proszę wybrać profil możliwy do zgłoszenia, aby edytować węzły.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Stuknij aby się wylogować",
     "requiredToSubmit": "Wymagane do zgłaszania danych kamer",
     "loggedOut": "Wylogowany",
+    "loginFailed": "Logowanie nie powiodło się. Spróbuj ponownie.",
     "testConnection": "Testuj Połączenie",
     "testConnectionSubtitle": "Sprawdź czy dane logowania OSM działają",
     "connectionOK": "Połączenie OK - dane logowania są ważne",
@@ -278,7 +283,10 @@
     "reauthLater": "Później",
     "unreadNotificationsTitle": "Masz Nieprzeczytane Powiadomienia",
     "unreadNotificationsMessage": "Masz nieprzeczytane wiadomości OSM i/lub nowe komentarze do Twoich zestawów zmian.",
-    "unreadNotificationsView": "Zobacz Teraz"
+    "unreadNotificationsView": "Zobacz Teraz",
+    "activeBlockTitle": "Twoje konto OSM ma aktywną blokadę",
+    "activeBlockMessage": "Twoje konto OpenStreetMap ma obecnie aktywną blokadę i nie może dokonywać zgłoszeń. Powinieneś był otrzymać wiadomość z dalszymi szczegółami; sprawdź swoją skrzynkę odbiorczą OSM, aby dowiedzieć się więcej.",
+    "viewBlockDetails": "Zobacz Szczegóły Blokady"
   },
   "queue": {
     "title": "Kolejka Przesyłania",
@@ -314,6 +322,7 @@
     "processingPaused": "Przetwarzanie Kolejki Wstrzymane",
     "pausedDueToOffline": "Przetwarzanie przesyłania jest wstrzymane, ponieważ tryb offline jest włączony.",
     "pausedByUser": "Przetwarzanie przesyłania jest ręcznie wstrzymane.",
+    "pausedDueToBlock": "Przetwarzanie kolejki przesyłania jest wstrzymane, ponieważ Twoje konto OSM ma aktywną blokadę.",
     "inFlightWaitTitle": "Kończenie Przesyłania",
     "inFlightWaitMessage": "Przesyłanie jest obecnie w toku i musi zostać zakończone, zanim to ustawienie będzie mogło zostać zastosowane. To powinno zająć tylko chwilę.",
     "inFlightCompleteTitle": "Przesyłanie Zakończone",
diff --git a/lib/localizations/pt.json b/lib/localizations/pt.json
index 2d0f48a..a934510 100644
--- a/lib/localizations/pt.json
+++ b/lib/localizations/pt.json
@@ -49,6 +49,7 @@
     "edit": "Editar",
     "delete": "Excluir",
     "cancel": "Cancelar",
+    "dismiss": "Dispensar",
     "ok": "OK",
     "close": "Fechar",
     "submit": "Enviar",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Personalizado..",
     "deleteReasonHint": "Descreva o motivo...",
     "mustBeLoggedInToDelete": "Você precisa estar conectado com uma conta do OpenStreetMap para contribuir com dados do mapa.",
+    "accountBlockedCannotDelete": "Sua conta OpenStreetMap tem um bloqueio ativo e não pode excluir nós.",
     "uploadPending": "Envio pendente",
     "uploadCreatingChangeset": "Criando changeset...",
     "uploadUploading": "Enviando...",
@@ -177,6 +179,7 @@
     "direction": "Direção  {}°",
     "profileNoDirectionInfo": "Este perfil não requer uma direção.",
     "mustBeLoggedIn": "Você deve estar logado para enviar novos nós. Por favor, faça login via Configurações.",
+    "accountBlocked": "Sua conta OpenStreetMap tem um bloqueio ativo e não pode enviar novos nós.",
     "enableSubmittableProfile": "Ative um perfil enviável nas Configurações para enviar novos nós.",
     "profileViewOnlyWarning": "Este perfil é apenas para visualização do mapa. Por favor, selecione um perfil enviável para enviar novos nós.",
     "loadingAreaData": "Carregando dados da área... Por favor aguarde antes de enviar.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Este perfil não requer uma direção.",
     "temporarilyDisabled": "As edições foram temporariamente desabilitadas enquanto resolvemos um bug - desculpe - volte em breve.",
     "mustBeLoggedIn": "Você deve estar logado para editar nós. Por favor, faça login via Configurações.",
+    "accountBlocked": "Sua conta OpenStreetMap tem um bloqueio ativo e não pode editar nós.",
     "sandboxModeWarning": "Não é possível enviar edições de nós de produção para o sandbox. Mude para o modo Produção nas Configurações para editar nós.",
     "enableSubmittableProfile": "Ative um perfil enviável nas Configurações para editar nós.",
     "profileViewOnlyWarning": "Este perfil é apenas para visualização do mapa. Por favor, selecione um perfil enviável para editar nós.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Toque para sair",
     "requiredToSubmit": "Necessário para enviar dados de câmeras",
     "loggedOut": "Deslogado",
+    "loginFailed": "Falha no login. Tente novamente.",
     "testConnection": "Testar Conexão",
     "testConnectionSubtitle": "Verificar se as credenciais OSM estão funcionando",
     "connectionOK": "Conexão OK - credenciais são válidas",
@@ -278,7 +283,10 @@
     "reauthLater": "Mais Tarde",
     "unreadNotificationsTitle": "Você Tem Notificações Não Lidas",
     "unreadNotificationsMessage": "Você tem mensagens OSM não lidas e/ou novos comentários nos seus changesets.",
-    "unreadNotificationsView": "Ver Agora"
+    "unreadNotificationsView": "Ver Agora",
+    "activeBlockTitle": "Sua conta OSM tem um bloqueio ativo",
+    "activeBlockMessage": "Sua conta OpenStreetMap atualmente tem um bloqueio ativo e está impedida de fazer envios. Você deve ter recebido uma mensagem com mais detalhes; verifique sua caixa de entrada do OSM para saber mais.",
+    "viewBlockDetails": "Ver Detalhes do Bloqueio"
   },
   "queue": {
     "title": "Fila de Upload",
@@ -314,6 +322,7 @@
     "processingPaused": "Processamento da Fila Pausado",
     "pausedDueToOffline": "O processamento de upload está pausado porque o modo offline está habilitado.",
     "pausedByUser": "O processamento de upload está pausado manualmente.",
+    "pausedDueToBlock": "O processamento da fila de upload está pausado porque sua conta OSM tem um bloqueio ativo.",
     "inFlightWaitTitle": "Finalizando Envio",
     "inFlightWaitMessage": "Atualmente há um envio em andamento que precisa terminar antes que esta configuração possa ser aplicada. Isso deve levar apenas um momento.",
     "inFlightCompleteTitle": "Envio Concluído",
diff --git a/lib/localizations/tr.json b/lib/localizations/tr.json
index 8fd429d..4f48680 100644
--- a/lib/localizations/tr.json
+++ b/lib/localizations/tr.json
@@ -49,6 +49,7 @@
     "edit": "Düzenle",
     "delete": "Sil",
     "cancel": "İptal",
+    "dismiss": "Kapat",
     "ok": "Tamam",
     "close": "Kapat",
     "submit": "Gönder",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Özel..",
     "deleteReasonHint": "Lütfen nedeni açıklayın...",
     "mustBeLoggedInToDelete": "Harita verilerine katkıda bulunmak için bir OpenStreetMap hesabıyla oturum açmış olmanız gerekir.",
+    "accountBlockedCannotDelete": "OpenStreetMap hesabınızda aktif bir engelleme var ve düğüm silemez.",
     "uploadPending": "Yükleme bekliyor",
     "uploadCreatingChangeset": "Değişiklik seti oluşturuluyor...",
     "uploadUploading": "Yükleniyor...",
@@ -177,6 +179,7 @@
     "direction": "Yön  {}°",
     "profileNoDirectionInfo": "Bu profil bir yön gerektirmez.",
     "mustBeLoggedIn": "Yeni düğümler göndermek için giriş yapmalısınız. Lütfen Ayarlar üzerinden giriş yapın.",
+    "accountBlocked": "OpenStreetMap hesabınızda aktif bir engelleme var ve yeni düğüm gönderemez.",
     "enableSubmittableProfile": "Yeni düğümler göndermek için Ayarlarda gönderilebilir bir profili etkinleştirin.",
     "profileViewOnlyWarning": "Bu profil sadece harita görüntüleme içindir. Yeni düğümler göndermek için lütfen gönderilebilir bir profil seçin.",
     "loadingAreaData": "Alan verisi yükleniyor... Göndermeden önce lütfen bekleyin.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Bu profil bir yön gerektirmez.",
     "temporarilyDisabled": "Bir hatayı çözmemiz sırasında düzenlemeler geçici olarak devre dışı bırakıldı - özür dileriz - yakında tekrar kontrol edin.",
     "mustBeLoggedIn": "Düğümleri düzenlemek için giriş yapmalısınız. Lütfen Ayarlar üzerinden giriş yapın.",
+    "accountBlocked": "OpenStreetMap hesabınızda aktif bir engelleme var ve düğüm düzenleyemez.",
     "sandboxModeWarning": "Üretim düğümlerinde düzenlemeleri sandbox'a gönderemezsiniz. Düğümleri düzenlemek için Ayarlar'da Üretim moduna geçin.",
     "enableSubmittableProfile": "Düğümleri düzenlemek için Ayarlarda gönderilebilir bir profili etkinleştirin.",
     "profileViewOnlyWarning": "Bu profil sadece harita görüntüleme içindir. Düğümleri düzenlemek için lütfen gönderilebilir bir profil seçin.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Çıkış yapmak için dokun",
     "requiredToSubmit": "Kamera verisi göndermek için gerekli",
     "loggedOut": "Çıkış yapıldı",
+    "loginFailed": "Giriş başarısız oldu. Lütfen tekrar deneyin.",
     "testConnection": "Bağlantıyı Test Et",
     "testConnectionSubtitle": "OSM kimlik bilgilerinin çalışıp çalışmadığını doğrulayın",
     "connectionOK": "Bağlantı Tamam - kimlik bilgileri geçerli",
@@ -278,7 +283,10 @@
     "reauthLater": "Sonra",
     "unreadNotificationsTitle": "Okunmamış Bildirimleriniz Var",
     "unreadNotificationsMessage": "Okunmamış OSM mesajlarınız ve/veya değişiklik kümelerinize yapılan yeni yorumlar var.",
-    "unreadNotificationsView": "Şimdi Görüntüle"
+    "unreadNotificationsView": "Şimdi Görüntüle",
+    "activeBlockTitle": "OSM Hesabınızda Aktif Bir Engelleme Var",
+    "activeBlockMessage": "OpenStreetMap hesabınızda şu anda aktif bir engelleme var ve gönderim yapmanız kısıtlanmış durumda. Daha fazla ayrıntı içeren bir mesaj almış olmalısınız; daha fazla bilgi için lütfen OSM gelen kutunuzu kontrol edin.",
+    "viewBlockDetails": "Engelleme Ayrıntılarını Görüntüle"
   },
   "queue": {
     "title": "Yükleme Kuyruğu",
@@ -314,6 +322,7 @@
     "processingPaused": "Kuyruk İşleme Duraklatıldı",
     "pausedDueToOffline": "Çevrimdışı mod etkin olduğu için yükleme işleme duraklatıldı.",
     "pausedByUser": "Yükleme işleme manuel olarak duraklatıldı.",
+    "pausedDueToBlock": "OSM hesabınızda aktif bir engelleme olduğu için yükleme işlemi duraklatıldı.",
     "inFlightWaitTitle": "Gönderim Tamamlanıyor",
     "inFlightWaitMessage": "Şu anda devam eden bir gönderim var ve bu ayar uygulanmadan önce tamamlanması gerekiyor. Bu sadece bir an sürmelidir.",
     "inFlightCompleteTitle": "Gönderim Tamamlandı",
diff --git a/lib/localizations/uk.json b/lib/localizations/uk.json
index d756f84..bb72834 100644
--- a/lib/localizations/uk.json
+++ b/lib/localizations/uk.json
@@ -49,6 +49,7 @@
     "edit": "Редагувати",
     "delete": "Видалити",
     "cancel": "Скасувати",
+    "dismiss": "Відхилити",
     "ok": "ОК",
     "close": "Закрити",
     "submit": "Подати",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "Власний..",
     "deleteReasonHint": "Опишіть причину...",
     "mustBeLoggedInToDelete": "Ви повинні увійти в обліковий запис OpenStreetMap, щоб надавати дані карти.",
+    "accountBlockedCannotDelete": "Ваш обліковий запис OpenStreetMap має активне блокування і не може видаляти вузли.",
     "uploadPending": "Завантаження очікує",
     "uploadCreatingChangeset": "Створення набору змін...",
     "uploadUploading": "Завантаження...",
@@ -177,6 +179,7 @@
     "direction": "Напрямок  {}°",
     "profileNoDirectionInfo": "Цей профіль не потребує напрямку.",
     "mustBeLoggedIn": "Ви повинні увійти в систему, щоб подавати нові вузли. Будь ласка, увійдіть через Налаштування.",
+    "accountBlocked": "Ваш обліковий запис OpenStreetMap має активне блокування і не може подавати нові вузли.",
     "enableSubmittableProfile": "Увімкніть профіль, який можна подавати, в Налаштуваннях для подання нових вузлів.",
     "profileViewOnlyWarning": "Цей профіль призначений лише для перегляду карти. Будь ласка, оберіть профіль, який можна подавати, для подання нових вузлів.",
     "loadingAreaData": "Завантаження даних області... Будь ласка, зачекайте перед поданням.",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "Цей профіль не потребує напрямку.",
     "temporarilyDisabled": "Редагування тимчасово вимкнено, поки ми розбираємося з помилкою - вибачте - перевірте пізніше.",
     "mustBeLoggedIn": "Ви повинні увійти в систему, щоб редагувати вузли. Будь ласка, увійдіть через Налаштування.",
+    "accountBlocked": "Ваш обліковий запис OpenStreetMap має активне блокування і не може редагувати вузли.",
     "sandboxModeWarning": "Не можна подавати редагування виробничих вузлів в sandbox. Перейдіть в режим Виробництва в Налаштуваннях для редагування вузлів.",
     "enableSubmittableProfile": "Увімкніть профіль, який можна подавати, в Налаштуваннях для редагування вузлів.",
     "profileViewOnlyWarning": "Цей профіль призначений лише для перегляду карти. Будь ласка, оберіть профіль, який можна подавати, для редагування вузлів.",
@@ -247,6 +251,7 @@
     "tapToLogout": "Натисніть для виходу",
     "requiredToSubmit": "Потрібно для подання даних камер",
     "loggedOut": "Вихід здійснено",
+    "loginFailed": "Не вдалося увійти. Спробуйте ще раз.",
     "testConnection": "Тестувати З'єднання",
     "testConnectionSubtitle": "Перевірити, що облікові дані OSM працюють",
     "connectionOK": "З'єднання в порядку - облікові дані дійсні",
@@ -278,7 +283,10 @@
     "reauthLater": "Пізніше",
     "unreadNotificationsTitle": "У Вас Є Непрочитані Сповіщення",
     "unreadNotificationsMessage": "У вас є непрочитані повідомлення OSM та/або нові коментарі до ваших наборів змін.",
-    "unreadNotificationsView": "Переглянути Зараз"
+    "unreadNotificationsView": "Переглянути Зараз",
+    "activeBlockTitle": "Ваш обліковий запис OSM має активне блокування",
+    "activeBlockMessage": "Ваш обліковий запис OpenStreetMap наразі має активне блокування і не може надсилати дані. Ви мали отримати повідомлення з додатковими деталями; перевірте свою поштову скриньку OSM, щоб дізнатися більше.",
+    "viewBlockDetails": "Переглянути Деталі Блокування"
   },
   "queue": {
     "title": "Черга Завантаження",
@@ -314,6 +322,7 @@
     "processingPaused": "Обробка Черги Призупинена",
     "pausedDueToOffline": "Обробка завантаження призупинена, оскільки увімкнено офлайн режим.",
     "pausedByUser": "Обробка завантаження призупинена вручну.",
+    "pausedDueToBlock": "Обробку черги завантаження призупинено, оскільки ваш обліковий запис OSM має активне блокування.",
     "inFlightWaitTitle": "Завершення Подання",
     "inFlightWaitMessage": "Наразі триває подання, яке потрібно завершити перед застосуванням цього налаштування. Це має зайняти лише мить.",
     "inFlightCompleteTitle": "Подання Завершено",
diff --git a/lib/localizations/zh.json b/lib/localizations/zh.json
index 15bd4b4..052ffd8 100644
--- a/lib/localizations/zh.json
+++ b/lib/localizations/zh.json
@@ -49,6 +49,7 @@
     "edit": "编辑",
     "delete": "删除",
     "cancel": "取消",
+    "dismiss": "关闭",
     "ok": "确定",
     "close": "关闭",
     "submit": "提交",
@@ -161,6 +162,7 @@
     "deleteReasonCustom": "自定义..",
     "deleteReasonHint": "请描述原因...",
     "mustBeLoggedInToDelete": "您必须使用 OpenStreetMap 账户登录才能贡献地图数据。",
+    "accountBlockedCannotDelete": "您的 OpenStreetMap 账户有一个有效封禁，无法删除节点。",
     "uploadPending": "上传待处理",
     "uploadCreatingChangeset": "正在创建变更集...",
     "uploadUploading": "正在上传...",
@@ -177,6 +179,7 @@
     "direction": "方向  {}°",
     "profileNoDirectionInfo": "此配置文件不需要方向。",
     "mustBeLoggedIn": "您必须登录才能提交新节点。请通过设置登录。",
+    "accountBlocked": "您的 OpenStreetMap 账户有一个有效封禁，无法提交新节点。",
     "enableSubmittableProfile": "在设置中启用可提交的配置文件以提交新节点。",
     "profileViewOnlyWarning": "此配置文件仅用于地图查看。请选择可提交的配置文件来提交新节点。",
     "loadingAreaData": "正在加载区域数据...提交前请稍候。",
@@ -191,6 +194,7 @@
     "profileNoDirectionInfo": "此配置文件不需要方向。",
     "temporarilyDisabled": "编辑功能已暂时禁用，我们正在修复一个错误 - 抱歉 - 请稍后再试。",
     "mustBeLoggedIn": "您必须登录才能编辑节点。请通过设置登录。",
+    "accountBlocked": "您的 OpenStreetMap 账户有一个有效封禁，无法编辑节点。",
     "sandboxModeWarning": "无法将生产节点的编辑提交到沙盒。在设置中切换到生产模式以编辑节点。",
     "enableSubmittableProfile": "在设置中启用可提交的配置文件以编辑节点。",
     "profileViewOnlyWarning": "此配置文件仅用于地图查看。请选择可提交的配置文件来编辑节点。",
@@ -247,6 +251,7 @@
     "tapToLogout": "点击登出",
     "requiredToSubmit": "提交摄像头数据所需",
     "loggedOut": "已登出",
+    "loginFailed": "登录失败，请重试。",
     "testConnection": "测试连接",
     "testConnectionSubtitle": "验证 OSM 凭据是否有效",
     "connectionOK": "连接正常 - 凭据有效",
@@ -278,7 +283,10 @@
     "reauthLater": "稍后",
     "unreadNotificationsTitle": "您有未读通知",
     "unreadNotificationsMessage": "您有未读的 OSM 消息和/或对您变更集的新评论。",
-    "unreadNotificationsView": "立即查看"
+    "unreadNotificationsView": "立即查看",
+    "activeBlockTitle": "您的 OSM 账户有一个有效封禁",
+    "activeBlockMessage": "您的 OpenStreetMap 账户目前有有效封禁，无法提交内容。您应该已收到一条包含更多详情的消息；请查看您的 OSM 收件箱以了解更多信息。",
+    "viewBlockDetails": "查看封禁详情"
   },
   "queue": {
     "title": "上传队列",
@@ -314,6 +322,7 @@
     "processingPaused": "队列处理已暂停",
     "pausedDueToOffline": "因为离线模式已启用，上传处理已暂停。",
     "pausedByUser": "上传处理已手动暂停。",
+    "pausedDueToBlock": "由于您的 OSM 账户有一个有效封禁，上传处理已暂停。",
     "inFlightWaitTitle": "正在完成提交",
     "inFlightWaitMessage": "当前有一个提交正在进行中，需要先完成才能应用此设置。这应该只需要一点时间。",
     "inFlightCompleteTitle": "提交完成",
diff --git a/lib/screens/home_screen.dart b/lib/screens/home_screen.dart
index 4e5e7f2..81fc157 100644
--- a/lib/screens/home_screen.dart
+++ b/lib/screens/home_screen.dart
@@ -37,7 +37,7 @@ class HomeScreen extends StatefulWidget {
   State<HomeScreen> createState() => _HomeScreenState();
 }
 
-class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
+class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin, WidgetsBindingObserver {
   final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();
   final GlobalKey<MapViewState> _mapViewKey = GlobalKey<MapViewState>();
   late final AnimatedMapController _mapController;
@@ -62,6 +62,7 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
   @override
   void initState() {
     super.initState();
+    WidgetsBinding.instance.addObserver(this);
     _mapController = AnimatedMapController(vsync: this);
     _sheetCoordinator = SheetCoordinator();
     _navigationCoordinator = NavigationCoordinator();
@@ -71,11 +72,24 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
     DeepLinkService().onNodeDeepLink = null;
     _mapController.dispose();
     super.dispose();
   }
 
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    // Re-check for an active OSM block when the user returns to the app,
+    // in case they resolved it (or got blocked) while away.
+    if (state == AppLifecycleState.resumed) {
+      final appState = context.read<AppState>();
+      if (appState.isLoggedIn) {
+        appState.checkAndPromptForActiveBlock(context);
+      }
+    }
+  }
+
   String _getFollowMeTooltip(FollowMeMode mode) {
     final locService = LocalizationService.instance;
     switch (mode) {
@@ -474,6 +488,10 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
         _checkForPopup();
         // Check if re-authentication is needed for message notifications
         appState.checkAndPromptReauthForMessages(context);
+        // Check for an active OSM block on app launch
+        if (appState.isLoggedIn) {
+          appState.checkAndPromptForActiveBlock(context);
+        }
       });
     }
 
@@ -544,7 +562,9 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
                 return IconButton(
                   tooltip: LocalizationService.instance.settings,
                   icon: Badge(
-                    isLabelVisible: appState.hasUnreadNotifications,
+                    isLabelVisible: appState.hasActiveBlock || appState.hasUnreadNotifications,
+                    backgroundColor: appState.hasActiveBlock ? Colors.red : null,
+                    label: appState.hasActiveBlock ? const Icon(Icons.block, size: 10, color: Colors.white) : null,
                     child: const Icon(Icons.settings),
                   ),
                   onPressed: () => Navigator.pushNamed(context, '/settings'),
diff --git a/lib/screens/osm_account_screen.dart b/lib/screens/osm_account_screen.dart
index 85cce6e..f54f7ca 100644
--- a/lib/screens/osm_account_screen.dart
+++ b/lib/screens/osm_account_screen.dart
@@ -17,11 +17,12 @@ class _OSMAccountScreenState extends State<OSMAccountScreen> {
   @override
   void initState() {
     super.initState();
-    // Check for messages when screen loads
+    // Check for messages and active blocks when screen loads
     WidgetsBinding.instance.addPostFrameCallback((_) {
       final appState = context.read<AppState>();
       if (appState.isLoggedIn) {
         appState.checkMessages();
+        appState.checkAndPromptForActiveBlock(context);
       }
     });
   }
@@ -74,22 +75,51 @@ class _OSMAccountScreenState extends State<OSMAccountScreen> {
                           }
                         } else {
                           // Start login flow - the user will be redirected to browser
-                          await appState.forceLogin();
+                          await appState.forceLogin(context: context);
                           
-                          // Don't show immediate feedback - the UI will update automatically
-                          // when the OAuth callback completes and notifyListeners() is called
+                          // Don't show immediate feedback on success - the UI will update
+                          // automatically when the OAuth callback completes and
+                          // notifyListeners() is called. Failures are surfaced directly
+                          // by forceLogin() via a snackbar/dialog.
                         }
                       },
                     ),
                     
                     if (appState.isLoggedIn) ...[
+                      // Active block warning - shown whenever a check has
+                      // found the user's OSM account currently blocked.
+                      if (appState.hasActiveBlock) ...[
+                        const Divider(),
+                        ListTile(
+                          leading: Badge(
+                            isLabelVisible: true,
+                            backgroundColor: Colors.red,
+                            child: const Icon(Icons.block, color: Colors.red),
+                          ),
+                          title: Text(locService.t('auth.activeBlockTitle')),
+                          subtitle: Text(locService.t('auth.activeBlockMessage')),
+                          trailing: const Icon(Icons.open_in_new),
+                          onTap: () async {
+                            final url = Uri.parse(appState.getBlockDetailsUrl());
+                            if (await canLaunchUrl(url)) {
+                              await launchUrl(url, mode: LaunchMode.externalApplication);
+                            } else {
+                              if (context.mounted) {
+                                ScaffoldMessenger.of(context).showSnackBar(
+                                  SnackBar(content: Text(locService.t('advancedEdit.couldNotOpenOSMWebsite'))),
+                                );
+                              }
+                            }
+                          },
+                        ),
+                      ],
                       const Divider(),
                       ListTile(
                         leading: const Icon(Icons.wifi_protected_setup),
                         title: Text(locService.t('auth.testConnection')),
                         subtitle: Text(locService.t('auth.testConnectionSubtitle')),
                         onTap: () async {
-                          final isValid = await appState.validateToken();
+                          final isValid = await appState.testConnection(context);
                           if (context.mounted) {
                             ScaffoldMessenger.of(context).showSnackBar(
                               SnackBar(
diff --git a/lib/screens/settings/sections/auth_section.dart b/lib/screens/settings/sections/auth_section.dart
index c2b666a..bd3ae1b 100644
--- a/lib/screens/settings/sections/auth_section.dart
+++ b/lib/screens/settings/sections/auth_section.dart
@@ -40,10 +40,12 @@ class AuthSection extends StatelessWidget {
                   }
                 } else {
                   // Start login flow - the user will be redirected to browser
-                  await appState.forceLogin();
+                  await appState.forceLogin(context: context);
                   
-                  // Don't show immediate feedback - the UI will update automatically
-                  // when the OAuth callback completes and notifyListeners() is called
+                  // Don't show immediate feedback on success - the UI will update
+                  // automatically when the OAuth callback completes and
+                  // notifyListeners() is called. Failures are surfaced directly
+                  // by forceLogin() via a snackbar/dialog.
                 }
               },
             ),
@@ -53,7 +55,7 @@ class AuthSection extends StatelessWidget {
                 title: Text(locService.t('auth.testConnection')),
                 subtitle: Text(locService.t('auth.testConnectionSubtitle')),
                 onTap: () async {
-                  final isValid = await appState.validateToken();
+                  final isValid = await appState.testConnection(context);
                   if (context.mounted) {
                     ScaffoldMessenger.of(context).showSnackBar(
                       SnackBar(
diff --git a/lib/screens/settings_screen.dart b/lib/screens/settings_screen.dart
index 63b055a..614a2bc 100644
--- a/lib/screens/settings_screen.dart
+++ b/lib/screens/settings_screen.dart
@@ -118,7 +118,9 @@ class SettingsScreen extends StatelessWidget {
     
     return ListTile(
       leading: Badge(
-        isLabelVisible: appState.hasUnreadNotifications,
+        isLabelVisible: appState.hasActiveBlock || appState.hasUnreadNotifications,
+        backgroundColor: appState.hasActiveBlock ? Colors.red : null,
+        label: appState.hasActiveBlock ? const Icon(Icons.block, size: 10, color: Colors.white) : null,
         child: const Icon(Icons.account_circle),
       ),
       title: Text(locService.t('auth.osmAccountTitle')),
diff --git a/lib/screens/upload_queue_screen.dart b/lib/screens/upload_queue_screen.dart
index 47efa6b..81f28c4 100644
--- a/lib/screens/upload_queue_screen.dart
+++ b/lib/screens/upload_queue_screen.dart
@@ -111,7 +111,7 @@ class UploadQueueScreen extends StatelessWidget {
         final appState = context.watch<AppState>();
         
         // Check if queue processing is paused
-        final isQueuePaused = appState.offlineMode || appState.pauseQueueProcessing;
+        final isQueuePaused = appState.offlineMode || appState.pauseQueueProcessing || appState.isQueuePausedDueToBlock;
         
         return Scaffold(
           appBar: AppBar(
@@ -151,9 +151,11 @@ class UploadQueueScreen extends StatelessWidget {
                               ),
                             ),
                             Text(
-                              appState.offlineMode 
-                                  ? locService.t('queue.pausedDueToOffline')
-                                  : locService.t('queue.pausedByUser'),
+                              appState.isQueuePausedDueToBlock
+                                  ? locService.t('queue.pausedDueToBlock')
+                                  : appState.offlineMode
+                                      ? locService.t('queue.pausedDueToOffline')
+                                      : locService.t('queue.pausedByUser'),
                               style: TextStyle(
                                 fontSize: 12,
                                 color: Colors.orange.shade700,
diff --git a/lib/services/auth_service.dart b/lib/services/auth_service.dart
index 4c7dcc4..c0c7aef 100644
--- a/lib/services/auth_service.dart
+++ b/lib/services/auth_service.dart
@@ -2,14 +2,42 @@ import 'dart:convert';
 import 'dart:developer';
 
 import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
 import 'package:oauth2_client/oauth2_client.dart';
 import 'package:oauth2_client/oauth2_helper.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 /// Handles PKCE OAuth login with OpenStreetMap.
 import '../keys.dart';
+import '../dev_config.dart';
 import '../app_state.dart' show UploadMode;
 import 'http_client.dart';
+import 'osm_block_service.dart';
+
+/// Thrown when the OAuth token exchange succeeds but a subsequent
+/// authenticated API call (e.g. fetching the username) fails. Carries the
+/// HTTP status code so callers can distinguish e.g. a 403 (often indicating
+/// an active account block) from other failures.
+class AuthApiException implements Exception {
+  final String message;
+  final int? statusCode;
+  final String? body;
+
+  AuthApiException(this.message, {this.statusCode, this.body});
+
+  @override
+  String toString() => 'AuthApiException: $message (status: $statusCode)';
+}
+
+/// Thrown when the OAuth token exchange succeeds but the account turns out
+/// to have an active OSM DWG block. Detected by checking the
+/// `user/blocks/active` endpoint (which is accessible even while blocked)
+/// immediately after obtaining the token, before attempting any other
+/// authenticated call that would otherwise fail with a 403.
+class AccountBlockedException implements Exception {
+  @override
+  String toString() => 'AccountBlockedException: account has an active OSM block';
+}
 
 class AuthService {
   // Both client IDs from keys.dart
@@ -18,8 +46,10 @@ class AuthService {
   late OAuth2Helper _helper;
   String? _displayName;
   UploadMode _mode = UploadMode.production;
+  final OSMBlockService _blockService;
 
-  AuthService({UploadMode mode = UploadMode.production}) {
+  AuthService({UploadMode mode = UploadMode.production, OSMBlockService? blockService})
+      : _blockService = blockService ?? OSMBlockService() {
     setUploadMode(mode);
   }
 
@@ -87,8 +117,12 @@ class AuthService {
     try {
       final token = await _helper.getToken();
       if (token.accessToken == null) {
+        debugPrint('AuthService: OAuth error: token null or missing accessToken (status: ${token.httpStatusCode}, error: ${token.error})');
         log('OAuth error: token null or missing accessToken');
-        return null;
+        throw AuthApiException(
+          'OAuth token exchange did not return an access token',
+          statusCode: token.httpStatusCode,
+        );
       }
       final tokenMap = {
         'accessToken': token.accessToken,
@@ -97,8 +131,55 @@ class AuthService {
       final tokenJson = jsonEncode(tokenMap);
       final prefs = await SharedPreferences.getInstance();
       await prefs.setString(_tokenKey, tokenJson); // Save token for current mode
-      _displayName = await _fetchUsername(token.accessToken!);
+
+      if (kCheckBlockBeforeUsernameFetch) {
+        // Check for an active block *before* fetching the username or
+        // anything else. As of writing, a blocked account's OAuth token
+        // exchange succeeds normally, but nearly every other authenticated
+        // endpoint (including user/details) returns 403. The blocks/active
+        // endpoint is explicitly documented as accessible even while
+        // blocked, so checking it first lets us detect this case reliably
+        // instead of getting a mysterious 403 from _fetchUsername with no
+        // way to tell why.
+        final isBlocked = await _blockService.checkActiveBlock(
+          accessToken: token.accessToken,
+          uploadMode: _mode,
+        );
+        if (isBlocked == true) {
+          debugPrint('AuthService: Login succeeded but account has an active block');
+          throw AccountBlockedException();
+        }
+      }
+
+      // Fetching the username can still fail even though the OAuth token
+      // exchange succeeded (e.g. if OSM ever allows this call to succeed for
+      // blocked accounts, kCheckBlockBeforeUsernameFetch would be false and
+      // we'd only find out here). Don't swallow that - the token is already
+      // saved, so the caller needs to know the login isn't actually usable
+      // rather than silently treating it as "not logged in".
+      try {
+        _displayName = await _fetchUsername(token.accessToken!);
+      } on AuthApiException {
+        // When we skipped the proactive check above, a 403 here could still
+        // mean the account is blocked - check blocks/active now so we can
+        // report that specifically instead of a generic auth failure.
+        if (!kCheckBlockBeforeUsernameFetch) {
+          final isBlocked = await _blockService.checkActiveBlock(
+            accessToken: token.accessToken,
+            uploadMode: _mode,
+          );
+          if (isBlocked == true) {
+            debugPrint('AuthService: user/details failed and account has an active block');
+            throw AccountBlockedException();
+          }
+        }
+        rethrow;
+      }
       return _displayName;
+    } on AccountBlockedException {
+      rethrow;
+    } on AuthApiException {
+      rethrow;
     } catch (e) {
       debugPrint('AuthService: OAuth login failed: $e');
       log('OAuth login failed: $e');
@@ -184,24 +265,37 @@ class AuthService {
   final _client = UserAgentClient();
 
   Future<String?> _fetchUsername(String accessToken) async {
+    final http.Response resp;
     try {
-      final resp = await _client.get(
+      resp = await _client.get(
         Uri.parse('$_apiHost/api/0.6/user/details.json'),
         headers: {'Authorization': 'Bearer $accessToken'},
       );
-      
-      if (resp.statusCode != 200) {
-        log('fetchUsername response ${resp.statusCode}: ${resp.body}');
-        return null;
-      }
-      final userData = jsonDecode(resp.body);
-      final displayName = userData['user']?['display_name'];
-      return displayName;
     } catch (e) {
+      // Network-level failure (no connection, timeout, etc.) - not
+      // indicative of a block, just a connectivity problem.
       debugPrint('AuthService: Error fetching username: $e');
       log('Error fetching username: $e');
-      return null;
+      rethrow;
     }
+
+    if (resp.statusCode != 200) {
+      // A non-200 here (very commonly 403) after a successful OAuth token
+      // exchange is a strong signal of an active account block. Surface it
+      // loudly via debugPrint (visible in a normal release/profile console,
+      // unlike dart:developer's log()) and throw instead of silently
+      // returning null, so the caller can show a real error to the user.
+      debugPrint('AuthService: fetchUsername failed - HTTP ${resp.statusCode}: ${resp.body}');
+      log('fetchUsername response ${resp.statusCode}: ${resp.body}');
+      throw AuthApiException(
+        'Failed to fetch user details after login',
+        statusCode: resp.statusCode,
+        body: resp.body,
+      );
+    }
+    final userData = jsonDecode(resp.body);
+    final displayName = userData['user']?['display_name'];
+    return displayName;
   }
 }
 
diff --git a/lib/services/osm_block_service.dart b/lib/services/osm_block_service.dart
new file mode 100644
index 0000000..49a9ceb
--- /dev/null
+++ b/lib/services/osm_block_service.dart
@@ -0,0 +1,55 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import '../state/settings_state.dart';
+import 'http_client.dart';
+
+/// Service for checking whether the current user has an active OSM DWG block.
+///
+/// See: https://wiki.openstreetmap.org/wiki/API_v0.6#List_active_blocks:_GET_/api/0.6/user/blocks/active
+class OSMBlockService {
+  final http.Client _client;
+
+  OSMBlockService({http.Client? client}) : _client = client ?? UserAgentClient();
+
+  /// Returns whether the user currently has an active block.
+  ///
+  /// Returns null if not logged in, in simulate mode, or on any error
+  /// (including no network connection) - callers should treat null as
+  /// "unknown, assume unchanged" rather than "not blocked".
+  Future<bool?> checkActiveBlock({
+    required String? accessToken,
+    required UploadMode uploadMode,
+  }) async {
+    if (uploadMode == UploadMode.simulate) return null;
+    if (accessToken == null || accessToken.isEmpty) return null;
+
+    try {
+      final apiHost = _getApiHost(uploadMode);
+      final response = await _client.get(
+        Uri.parse('$apiHost/api/0.6/user/blocks/active.json'),
+        headers: {'Authorization': 'Bearer $accessToken'},
+      );
+
+      if (response.statusCode != 200) return null;
+
+      final data = jsonDecode(response.body);
+      final userBlocks = data['user_blocks'];
+      if (userBlocks is! List) return null;
+
+      return userBlocks.isNotEmpty;
+    } catch (e) {
+      return null;
+    }
+  }
+
+  String _getApiHost(UploadMode uploadMode) {
+    switch (uploadMode) {
+      case UploadMode.production:
+        return 'https://api.openstreetmap.org';
+      case UploadMode.sandbox:
+        return 'https://api06.dev.openstreetmap.org';
+      case UploadMode.simulate:
+        return 'https://api.openstreetmap.org';
+    }
+  }
+}
diff --git a/lib/state/account_block_state.dart b/lib/state/account_block_state.dart
new file mode 100644
index 0000000..e7d8547
--- /dev/null
+++ b/lib/state/account_block_state.dart
@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../services/osm_block_service.dart';
+import 'settings_state.dart';
+
+/// Tracks whether the current user has an active OSM DWG block.
+///
+/// Persisted per upload mode so the last known state survives app restarts
+/// (e.g. launching offline) - a failed/inconclusive check leaves the
+/// persisted value untouched rather than assuming "not blocked".
+class AccountBlockState extends ChangeNotifier {
+  final OSMBlockService _blockService;
+
+  AccountBlockState({OSMBlockService? blockService})
+      : _blockService = blockService ?? OSMBlockService();
+
+  bool _isBlocked = false;
+
+  bool get isBlocked => _isBlocked;
+
+  /// Load the last known block state for the given upload mode.
+  Future<void> init(UploadMode uploadMode) async {
+    final prefs = await SharedPreferences.getInstance();
+    _isBlocked = prefs.getBool(_prefsKey(uploadMode)) ?? false;
+    notifyListeners();
+  }
+
+  /// Check for an active block. Returns the conclusive result (true/false),
+  /// or null if the check was inconclusive (offline, error, not logged in,
+  /// simulate mode). On null, the previously known state is left unchanged.
+  Future<bool?> check({
+    required String? accessToken,
+    required UploadMode uploadMode,
+  }) async {
+    final result = await _blockService.checkActiveBlock(
+      accessToken: accessToken,
+      uploadMode: uploadMode,
+    );
+
+    if (result != null && result != _isBlocked) {
+      _isBlocked = result;
+      final prefs = await SharedPreferences.getInstance();
+      await prefs.setBool(_prefsKey(uploadMode), result);
+      notifyListeners();
+    }
+
+    return result;
+  }
+
+  /// Clear block state (called on logout).
+  void clear() {
+    if (_isBlocked) {
+      _isBlocked = false;
+      notifyListeners();
+    }
+  }
+
+  String _prefsKey(UploadMode uploadMode) => 'account_blocked_${uploadMode.name}';
+}
diff --git a/lib/state/auth_state.dart b/lib/state/auth_state.dart
index dcf163b..1a735e5 100644
--- a/lib/state/auth_state.dart
+++ b/lib/state/auth_state.dart
@@ -28,11 +28,16 @@ class AuthState extends ChangeNotifier {
   Future<void> login() async {
     try {
       _username = await _auth.login();
+      notifyListeners();
     } catch (e) {
       debugPrint("AuthState: Login error: $e");
       _username = null;
+      notifyListeners();
+      // Don't swallow this - the caller (AppState) needs to know login
+      // failed so it can tell the user, rather than silently staying
+      // logged out with no explanation.
+      rethrow;
     }
-    notifyListeners();
   }
 
   Future<void> logout() async {
@@ -58,11 +63,16 @@ class AuthState extends ChangeNotifier {
   Future<void> forceLogin() async {
     try {
       _username = await _auth.forceLogin();
+      notifyListeners();
     } catch (e) {
       debugPrint("AuthState: Forced login error: $e");
       _username = null;
+      notifyListeners();
+      // Don't swallow this - the caller (AppState) needs to know login
+      // failed so it can tell the user, rather than silently staying
+      // logged out with no explanation.
+      rethrow;
     }
-    notifyListeners();
   }
 
   Future<bool> validateToken() async {
diff --git a/lib/state/upload_queue_state.dart b/lib/state/upload_queue_state.dart
index 15557f4..a2387c9 100644
--- a/lib/state/upload_queue_state.dart
+++ b/lib/state/upload_queue_state.dart
@@ -20,11 +20,13 @@ class UploadQueueState extends ChangeNotifier {
   final List<PendingUpload> _queue = [];
   Timer? _uploadTimer;
   int _activeUploadCount = 0;
+  bool _isPausedDueToBlock = false;
 
   // Getters
   int get pendingCount => _queue.length;
   List<PendingUpload> get pendingUploads => List.unmodifiable(_queue);
   int get activeUploadCount => _activeUploadCount;
+  bool get isPausedDueToBlock => _isPausedDueToBlock;
 
   // Initialize by loading queue from storage and repopulate cache with pending nodes
   Future<void> init() async {
@@ -326,8 +328,10 @@ class UploadQueueState extends ChangeNotifier {
     required bool pauseQueueProcessing,
     required UploadMode uploadMode,
     required Future<String?> Function() getAccessToken,
+    required Future<bool?> Function() checkActiveBlock,
   }) {
     _uploadTimer?.cancel();
+    _isPausedDueToBlock = false;
 
     // No uploads if queue is empty, offline mode is enabled, or queue processing is paused
     if (_queue.isEmpty || offlineMode || pauseQueueProcessing) return;
@@ -386,6 +390,16 @@ class UploadQueueState extends ChangeNotifier {
       final access = await getAccessToken();
       if (access == null) return; // not logged in
 
+      // Don't start new uploads if the user has an active OSM block.
+      // Leave the item pending - it'll be retried next time the uploader starts.
+      if (await checkActiveBlock() == true) {
+        debugPrint('[UploadQueue] Active block detected, pausing queue processing');
+        _isPausedDueToBlock = true;
+        _uploadTimer?.cancel();
+        notifyListeners();
+        return;
+      }
+
       // Start processing the next pending upload
       final item = pendingItems.first;
       debugPrint('[UploadQueue] Starting new upload processing for item at ${item.coord} ($_activeUploadCount/$kMaxConcurrentUploads active)');
diff --git a/lib/widgets/active_block_dialog.dart b/lib/widgets/active_block_dialog.dart
new file mode 100644
index 0000000..5d0b3e5
--- /dev/null
+++ b/lib/widgets/active_block_dialog.dart
@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+import '../services/localization_service.dart';
+
+/// Dialog shown whenever a check finds that the user's OSM account has an
+/// active block. Unlike the unread-notifications dialog, this has no
+/// "don't show again" option and is shown every time a check finds a block.
+class ActiveBlockDialog extends StatelessWidget {
+  final VoidCallback onViewDetails;
+  final VoidCallback onDismiss;
+
+  const ActiveBlockDialog({
+    super.key,
+    required this.onViewDetails,
+    required this.onDismiss,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final locService = LocalizationService.instance;
+
+    return AlertDialog(
+      title: Row(
+        children: [
+          Icon(
+            Icons.block,
+            color: Theme.of(context).colorScheme.error,
+          ),
+          const SizedBox(width: 8),
+          Expanded(
+            child: Text(locService.t('auth.activeBlockTitle')),
+          ),
+        ],
+      ),
+      content: Text(locService.t('auth.activeBlockMessage')),
+      actions: [
+        TextButton(
+          onPressed: () {
+            Navigator.of(context).pop();
+            onDismiss();
+          },
+          child: Text(locService.t('actions.dismiss')),
+        ),
+        FilledButton.icon(
+          onPressed: () {
+            Navigator.of(context).pop();
+            onViewDetails();
+          },
+          icon: const Icon(Icons.open_in_new, size: 18),
+          label: Text(locService.t('auth.viewBlockDetails')),
+        ),
+      ],
+    );
+  }
+}
diff --git a/lib/widgets/add_node_sheet.dart b/lib/widgets/add_node_sheet.dart
index 38cdabb..daf9255 100644
--- a/lib/widgets/add_node_sheet.dart
+++ b/lib/widgets/add_node_sheet.dart
@@ -421,6 +421,7 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
         }
         
         final allowSubmit = appState.isLoggedIn && 
+            !appState.hasActiveBlock &&
             submittableProfiles.isNotEmpty && 
             session.profile != null && 
             session.profile!.isSubmittable &&
@@ -493,6 +494,22 @@ class _AddNodeSheetState extends State<AddNodeSheet> {
                     ],
                   ),
                 )
+              else if (appState.hasActiveBlock)
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
+                  child: Row(
+                    children: [
+                      const Icon(Icons.block, color: Colors.red, size: 20),
+                      const SizedBox(width: 6),
+                      Expanded(
+                        child: Text(
+                          locService.t('addNode.accountBlocked'),
+                          style: const TextStyle(color: Colors.red, fontSize: 13),
+                        ),
+                      ),
+                    ],
+                  ),
+                )
               else if (submittableProfiles.isEmpty)
                 Padding(
                   padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
diff --git a/lib/widgets/edit_node_sheet.dart b/lib/widgets/edit_node_sheet.dart
index 2131172..b3f8915 100644
--- a/lib/widgets/edit_node_sheet.dart
+++ b/lib/widgets/edit_node_sheet.dart
@@ -377,6 +377,7 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
         
         final allowSubmit = kEnableNodeEdits && 
             appState.isLoggedIn && 
+            !appState.hasActiveBlock &&
             submittableProfiles.isNotEmpty && 
             session.profile != null && 
             session.profile!.isSubmittable &&
@@ -526,6 +527,22 @@ class _EditNodeSheetState extends State<EditNodeSheet> {
                     ],
                   ),
                 )
+              else if (appState.hasActiveBlock)
+                Padding(
+                  padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
+                  child: Row(
+                    children: [
+                      const Icon(Icons.block, color: Colors.red, size: 20),
+                      const SizedBox(width: 6),
+                      Expanded(
+                        child: Text(
+                          locService.t('editNode.accountBlocked'),
+                          style: const TextStyle(color: Colors.red, fontSize: 13),
+                        ),
+                      ),
+                    ],
+                  ),
+                )
               else if (submittableProfiles.isEmpty)
                 Padding(
                   padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
diff --git a/lib/widgets/node_tag_sheet.dart b/lib/widgets/node_tag_sheet.dart
index c728af1..1c13341 100644
--- a/lib/widgets/node_tag_sheet.dart
+++ b/lib/widgets/node_tag_sheet.dart
@@ -184,6 +184,23 @@ class _NodeTagSheetState extends State<NodeTagSheet> {
             return;
           }
 
+          if (appState.hasActiveBlock) {
+            await showDialog<void>(
+              context: context,
+              builder: (BuildContext context) => AlertDialog(
+                title: Text(locService.t('node.confirmDeleteTitle')),
+                content: Text(locService.t('node.accountBlockedCannotDelete')),
+                actions: [
+                  TextButton(
+                    onPressed: () => Navigator.of(context).pop(),
+                    child: Text(locService.ok),
+                  ),
+                ],
+              ),
+            );
+            return;
+          }
+
           final result = await showDialog<({bool confirmed, String comment})>(
             context: context,
             builder: (BuildContext context) => _DeleteNodeDialog(
diff --git a/test/services/osm_block_service_test.dart b/test/services/osm_block_service_test.dart
new file mode 100644
index 0000000..13c2de8
--- /dev/null
+++ b/test/services/osm_block_service_test.dart
@@ -0,0 +1,164 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+
+import 'package:deflockapp/services/osm_block_service.dart';
+import 'package:deflockapp/state/settings_state.dart';
+
+void main() {
+  group('OSMBlockService', () {
+    test('returns null in simulate mode without making a request', () async {
+      var requested = false;
+      final client = MockClient((request) async {
+        requested = true;
+        return http.Response('{"user_blocks":[]}', 200);
+      });
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.simulate,
+      );
+
+      expect(result, isNull);
+      expect(requested, isFalse);
+    });
+
+    test('returns null when access token is null', () async {
+      final client = MockClient((request) async => http.Response('{"user_blocks":[]}', 200));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: null,
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+
+    test('returns null when access token is empty', () async {
+      final client = MockClient((request) async => http.Response('{"user_blocks":[]}', 200));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: '',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+
+    test('returns false when user_blocks is empty', () async {
+      final client = MockClient((request) async => http.Response('{"user_blocks":[]}', 200));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isFalse);
+    });
+
+    test('returns true when user_blocks is non-empty', () async {
+      final client = MockClient((request) async => http.Response(
+            '{"user_blocks":[{"id":101,"needs_view":true}]}',
+            200,
+          ));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isTrue);
+    });
+
+    test('sends the request to the correct production host with auth header', () async {
+      Uri? capturedUri;
+      String? capturedAuth;
+      final client = MockClient((request) async {
+        capturedUri = request.url;
+        capturedAuth = request.headers['Authorization'];
+        return http.Response('{"user_blocks":[]}', 200);
+      });
+      final service = OSMBlockService(client: client);
+
+      await service.checkActiveBlock(
+        accessToken: 'my-token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(capturedUri?.host, 'api.openstreetmap.org');
+      expect(capturedUri?.path, '/api/0.6/user/blocks/active.json');
+      expect(capturedAuth, 'Bearer my-token');
+    });
+
+    test('sends the request to the sandbox host in sandbox mode', () async {
+      Uri? capturedUri;
+      final client = MockClient((request) async {
+        capturedUri = request.url;
+        return http.Response('{"user_blocks":[]}', 200);
+      });
+      final service = OSMBlockService(client: client);
+
+      await service.checkActiveBlock(
+        accessToken: 'my-token',
+        uploadMode: UploadMode.sandbox,
+      );
+
+      expect(capturedUri?.host, 'api06.dev.openstreetmap.org');
+    });
+
+    test('returns null on non-200 response', () async {
+      final client = MockClient((request) async => http.Response('Unauthorized', 401));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+
+    test('returns null on malformed JSON response', () async {
+      final client = MockClient((request) async => http.Response('not json', 200));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+
+    test('returns null when user_blocks field is missing', () async {
+      final client = MockClient((request) async => http.Response('{}', 200));
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+
+    test('returns null when the client throws (e.g. no network)', () async {
+      final client = MockClient((request) async {
+        throw Exception('network error');
+      });
+      final service = OSMBlockService(client: client);
+
+      final result = await service.checkActiveBlock(
+        accessToken: 'token',
+        uploadMode: UploadMode.production,
+      );
+
+      expect(result, isNull);
+    });
+  });
+}
diff --git a/test/state/account_block_state_test.dart b/test/state/account_block_state_test.dart
new file mode 100644
index 0000000..88504f1
--- /dev/null
+++ b/test/state/account_block_state_test.dart
@@ -0,0 +1,118 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'package:deflockapp/services/osm_block_service.dart';
+import 'package:deflockapp/state/account_block_state.dart';
+import 'package:deflockapp/state/settings_state.dart';
+
+void main() {
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+  });
+
+  group('AccountBlockState', () {
+    test('defaults to not blocked before init()', () {
+      final state = AccountBlockState();
+      expect(state.isBlocked, isFalse);
+    });
+
+    test('init() loads persisted blocked state for the given upload mode', () async {
+      SharedPreferences.setMockInitialValues({
+        'account_blocked_production': true,
+      });
+
+      final state = AccountBlockState();
+      await state.init(UploadMode.production);
+
+      expect(state.isBlocked, isTrue);
+    });
+
+    test('init() defaults to false when nothing is persisted', () async {
+      final state = AccountBlockState();
+      await state.init(UploadMode.production);
+
+      expect(state.isBlocked, isFalse);
+    });
+
+    test('init() is scoped per upload mode', () async {
+      SharedPreferences.setMockInitialValues({
+        'account_blocked_production': true,
+      });
+
+      final state = AccountBlockState();
+      await state.init(UploadMode.sandbox);
+
+      expect(state.isBlocked, isFalse);
+    });
+
+    test('check() updates and persists state on a conclusive true result', () async {
+      final client = MockClient((request) async => http.Response(
+            '{"user_blocks":[{"id":1}]}',
+            200,
+          ));
+      final state = AccountBlockState(blockService: OSMBlockService(client: client));
+      await state.init(UploadMode.production);
+
+      final result = await state.check(accessToken: 'token', uploadMode: UploadMode.production);
+
+      expect(result, isTrue);
+      expect(state.isBlocked, isTrue);
+
+      final prefs = await SharedPreferences.getInstance();
+      expect(prefs.getBool('account_blocked_production'), isTrue);
+    });
+
+    test('check() updates and persists state on a conclusive false result', () async {
+      SharedPreferences.setMockInitialValues({
+        'account_blocked_production': true,
+      });
+      final client = MockClient((request) async => http.Response('{"user_blocks":[]}', 200));
+      final state = AccountBlockState(blockService: OSMBlockService(client: client));
+      await state.init(UploadMode.production);
+      expect(state.isBlocked, isTrue);
+
+      final result = await state.check(accessToken: 'token', uploadMode: UploadMode.production);
+
+      expect(result, isFalse);
+      expect(state.isBlocked, isFalse);
+
+      final prefs = await SharedPreferences.getInstance();
+      expect(prefs.getBool('account_blocked_production'), isFalse);
+    });
+
+    test('check() leaves state unchanged on an inconclusive (null) result', () async {
+      SharedPreferences.setMockInitialValues({
+        'account_blocked_production': true,
+      });
+      final client = MockClient((request) async {
+        throw Exception('offline');
+      });
+      final state = AccountBlockState(blockService: OSMBlockService(client: client));
+      await state.init(UploadMode.production);
+      expect(state.isBlocked, isTrue);
+
+      final result = await state.check(accessToken: 'token', uploadMode: UploadMode.production);
+
+      expect(result, isNull);
+      expect(state.isBlocked, isTrue); // unchanged
+
+      final prefs = await SharedPreferences.getInstance();
+      expect(prefs.getBool('account_blocked_production'), isTrue); // unchanged
+    });
+
+    test('clear() resets in-memory blocked state', () async {
+      SharedPreferences.setMockInitialValues({
+        'account_blocked_production': true,
+      });
+      final state = AccountBlockState();
+      await state.init(UploadMode.production);
+      expect(state.isBlocked, isTrue);
+
+      state.clear();
+
+      expect(state.isBlocked, isFalse);
+    });
+  });
+}