diff --git a/backend/FwDataMiniLcmBridge/FwDataBridgeKernel.cs b/backend/FwDataMiniLcmBridge/FwDataBridgeKernel.cs
index 165ff881b7..4e7ab74ffb 100644
--- a/backend/FwDataMiniLcmBridge/FwDataBridgeKernel.cs
+++ b/backend/FwDataMiniLcmBridge/FwDataBridgeKernel.cs
@@ -13,8 +13,6 @@ public static IServiceCollection AddFwDataBridge(this IServiceCollection service
         services.AddLogging();
         services.AddSingleton<FwDataFactory>();
         services.AddSingleton<IProjectLoader, ProjectLoader>();
-        //todo since this is scoped it gets created on each request (or hub method call), which opens the project file on each request
-        //this is not ideal since opening the project file can be slow. It should be done once per hub connection.
         services.AddKeyedScoped<ILexboxApi>(FwDataApiKey, (provider, o) => provider.GetRequiredService<FwDataFactory>().GetCurrentFwDataMiniLcmApi(true));
         services.AddSingleton<FwDataProjectContext>();
         return services;
diff --git a/backend/FwDataMiniLcmBridge/FwDataFactory.cs b/backend/FwDataMiniLcmBridge/FwDataFactory.cs
index 80b872a8f7..b9672dadfe 100644
--- a/backend/FwDataMiniLcmBridge/FwDataFactory.cs
+++ b/backend/FwDataMiniLcmBridge/FwDataFactory.cs
@@ -64,9 +64,12 @@ private static void OnLcmProjectCacheEviction(object key, object? value, Evictio
         var (logger, projects) = ((ILogger<FwDataFactory>, HashSet<string>))state!;
         var name = lcmCache.ProjectId.Name;
         logger.LogInformation("Evicting project {ProjectFileName} from cache", name);
-        lcmCache.Dispose();
-        logger.LogInformation("FW Data Project {ProjectFileName} disposed", name);
         projects.Remove((string)key);
+        if (!lcmCache.IsDisposed)
+        {
+            lcmCache.Dispose();
+            logger.LogInformation("FW Data Project {ProjectFileName} disposed", name);
+        }
     }
 
     public void Dispose()
@@ -90,4 +93,19 @@ public FwDataMiniLcmApi GetCurrentFwDataMiniLcmApi(bool saveOnDispose)
         }
         return GetFwDataMiniLcmApi(fwDataProject, true);
     }
+
+    public void CloseCurrentProject()
+    {
+        var fwDataProject = context.Project;
+        if (fwDataProject is null) return;
+        CloseProject(fwDataProject);
+    }
+
+    private void CloseProject(FwDataProject project)
+    {
+        var cacheKey = CacheKey(project);
+        var lcmCache = cache.Get<LcmCache>(cacheKey);
+        if (lcmCache is null) return;
+        cache.Remove(cacheKey);
+    }
 }
diff --git a/backend/LocalWebApp/Hubs/CrdtMiniLcmApiHub.cs b/backend/LocalWebApp/Hubs/CrdtMiniLcmApiHub.cs
index 72c600fdb1..3634d5f36d 100644
--- a/backend/LocalWebApp/Hubs/CrdtMiniLcmApiHub.cs
+++ b/backend/LocalWebApp/Hubs/CrdtMiniLcmApiHub.cs
@@ -9,6 +9,7 @@ namespace LocalWebApp.Hubs;
 public interface ILexboxClient
 {
     Task OnEntryUpdated(Entry entry);
+    Task OnProjectClosed();
 }
 
 public class CrdtMiniLcmApiHub(
diff --git a/backend/LocalWebApp/Hubs/FwDataMiniLcmHub.cs b/backend/LocalWebApp/Hubs/FwDataMiniLcmHub.cs
index 039f1b929e..9d1e887fc4 100644
--- a/backend/LocalWebApp/Hubs/FwDataMiniLcmHub.cs
+++ b/backend/LocalWebApp/Hubs/FwDataMiniLcmHub.cs
@@ -6,11 +6,31 @@
 
 namespace LocalWebApp.Hubs;
 
-public class FwDataMiniLcmHub([FromKeyedServices(FwDataBridgeKernel.FwDataApiKey)] ILexboxApi lexboxApi) : Hub<ILexboxClient>
+public class FwDataMiniLcmHub([FromKeyedServices(FwDataBridgeKernel.FwDataApiKey)] ILexboxApi lexboxApi, FwDataFactory fwDataFactory,
+    FwDataProjectContext context) : Hub<ILexboxClient>
 {
     public const string ProjectRouteKey = "fwdata";
     public override async Task OnConnectedAsync()
     {
+        var project = context.Project;
+        if (project is null)
+        {
+            throw new InvalidOperationException("No project is set in the context.");
+        }
+        await Groups.AddToGroupAsync(Context.ConnectionId, project.Name);
+    }
+
+    public override async Task OnDisconnectedAsync(Exception? exception)
+    {
+        //todo if multiple clients are connected, this will close the project for all of them.
+        fwDataFactory.CloseCurrentProject();
+        var project = context.Project;
+        if (project is null)
+        {
+            throw new InvalidOperationException("No project is set in the context.");
+        }
+        await Clients.OthersInGroup(project.Name).OnProjectClosed();
+        await Groups.RemoveFromGroupAsync(Context.ConnectionId, project.Name);
     }
 
     public async Task<WritingSystems> GetWritingSystems()
diff --git a/backend/LocalWebApp/appsettings.Development.json b/backend/LocalWebApp/appsettings.Development.json
index 960be50673..cd58546495 100644
--- a/backend/LocalWebApp/appsettings.Development.json
+++ b/backend/LocalWebApp/appsettings.Development.json
@@ -1,7 +1,8 @@
 {
   "Logging": {
     "LogLevel": {
-      "Default": "Information"
+      "Default": "Information",
+      "LocalWebApp.Auth.LoggerAdapter": "Warning",
     }
   }
 }
diff --git a/frontend/viewer/src/App.svelte b/frontend/viewer/src/App.svelte
index ccfca65184..60aeae4f93 100644
--- a/frontend/viewer/src/App.svelte
+++ b/frontend/viewer/src/App.svelte
@@ -4,6 +4,7 @@
   import TestProjectView from './TestProjectView.svelte';
   import FwDataProjectView from './FwDataProjectView.svelte';
   import HomeView from './HomeView.svelte';
+  import NotificationOutlet from './lib/notifications/NotificationOutlet.svelte';
   import Sandbox from './lib/sandbox/Sandbox.svelte';
 
   export let url = '';
@@ -38,3 +39,4 @@
     </Route>
   </div>
 </Router>
+<NotificationOutlet/>
diff --git a/frontend/viewer/src/FwDataProjectView.svelte b/frontend/viewer/src/FwDataProjectView.svelte
index 3b7fff518a..30f9232aad 100644
--- a/frontend/viewer/src/FwDataProjectView.svelte
+++ b/frontend/viewer/src/FwDataProjectView.svelte
@@ -4,6 +4,8 @@
   import {onDestroy, setContext} from 'svelte';
   import {SetupSignalR} from './lib/services/service-provider-signalr';
   import ProjectView from './ProjectView.svelte';
+  import {navigate} from 'svelte-routing';
+  import {AppNotification} from './lib/notifications/notifications';
 
   export let projectName: string;
   const connection = new HubConnectionBuilder()
@@ -18,6 +20,10 @@
   SetupSignalR(connection, {
     history: false,
     write: true,
+  },
+  async () => {
+    navigate('/');
+    AppNotification.display('Project closed on another tab', 'warning', 'long');
   });
   let connected = false;
 </script>
diff --git a/frontend/viewer/src/ProjectView.svelte b/frontend/viewer/src/ProjectView.svelte
index 1ae31435d7..cf0f7fd4be 100644
--- a/frontend/viewer/src/ProjectView.svelte
+++ b/frontend/viewer/src/ProjectView.svelte
@@ -1,7 +1,8 @@
 <script lang="ts">
   import {AppBar, Button, ProgressCircle} from 'svelte-ux';
-  import {mdiArrowCollapseLeft, mdiArrowCollapseRight, mdiArrowLeft, mdiEyeSettingsOutline} from '@mdi/js';
+  import {mdiArrowCollapseLeft, mdiArrowCollapseRight, mdiArrowLeft, mdiEyeSettingsOutline, mdiHome} from '@mdi/js';
   import Editor from './lib/Editor.svelte';
+  import {navigate} from 'svelte-routing';
   import {headword, pickBestAlternative} from './lib/utils';
   import {views} from './lib/config-data';
   import {useLexboxApi} from './lib/services/service-provider';
@@ -57,6 +58,7 @@
 
   export let projectName: string;
   export let isConnected: boolean;
+  export let showHomeButton = true;
   $: connected.set(isConnected);
 
   const connected = writable(false);
@@ -228,7 +230,13 @@
 </div>
 {:else}
 <div class="project-view !flex flex-col PortalTarget" style="{spaceForEditorStyle}">
-  <AppBar title={projectName} class="bg-secondary min-h-12 shadow-md" menuIcon=''>
+  <AppBar title={projectName} class="bg-secondary min-h-12 shadow-md">
+    <Button
+      classes={{root: showHomeButton ? '' : 'hidden'}}
+      slot="menuIcon"
+      icon={mdiHome}
+      on:click={() => navigate('/')}
+    />
     <div class="flex-grow-0 flex-shrink-0 lg:hidden mx-2 sm:mr-0" class:invisible={!pickedEntry}>
       <Button icon={mdiArrowLeft} size="sm" iconOnly rounded variant="outline" on:click={() => pickedEntry = false} />
     </div>
diff --git a/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/Lexbox.ClientServer.Hubs.ts b/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/Lexbox.ClientServer.Hubs.ts
index 3c174506ec..7800cf6807 100644
--- a/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/Lexbox.ClientServer.Hubs.ts
+++ b/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/Lexbox.ClientServer.Hubs.ts
@@ -13,5 +13,6 @@ export type ILexboxClient = {
     * @returns Transpiled from System.Threading.Tasks.Task
     */
     OnEntryUpdated(entry: Entry): Promise<void>;
+    OnProjectClosed(): Promise<void>;
 }
 
diff --git a/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/index.ts b/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/index.ts
index cb9024a277..36553d8277 100644
--- a/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/index.ts
+++ b/frontend/viewer/src/lib/generated-signalr-client/TypedSignalR.Client/index.ts
@@ -203,11 +203,14 @@ class ILexboxClient_Binder implements ReceiverRegister<ILexboxClient> {
     public readonly register = (connection: HubConnection, receiver: ILexboxClient): Disposable => {
 
         const __onEntryUpdated = (...args: [Entry]) => receiver.OnEntryUpdated(...args);
+        const __onProjectClosed = () => receiver.OnProjectClosed();
 
         connection.on("OnEntryUpdated", __onEntryUpdated);
+        connection.on("OnProjectClosed", __onProjectClosed);
 
         const methodList: ReceiverMethod[] = [
-            { methodName: "OnEntryUpdated", method: __onEntryUpdated }
+            { methodName: "OnEntryUpdated", method: __onEntryUpdated },
+            { methodName: "OnProjectClosed", method: __onProjectClosed },
         ]
 
         return new ReceiverMethodSubscription(connection, methodList);
diff --git a/frontend/viewer/src/lib/notifications/NotificationOutlet.svelte b/frontend/viewer/src/lib/notifications/NotificationOutlet.svelte
new file mode 100644
index 0000000000..2d0a5bd628
--- /dev/null
+++ b/frontend/viewer/src/lib/notifications/NotificationOutlet.svelte
@@ -0,0 +1,32 @@
+<script lang="ts">
+  import {AppNotification} from './notifications';
+  import {Notification, Icon} from 'svelte-ux';
+  import {
+    mdiAlert,
+    mdiAlertCircleOutline,
+    mdiCheckCircleOutline,
+    mdiInformationOutline
+  } from '@mdi/js';
+
+  const notifications = AppNotification.notifications;
+</script>
+<div class="fixed bottom-0 z-50 flex flex-col gap-2 p-4 w-full overflow-y-auto">
+  {#each $notifications as notification}
+    <div class="w-[400px] mx-auto">
+      <Notification open closeIcon>
+        <div slot="icon">
+          {#if notification.type === 'success'}
+            <Icon path={mdiCheckCircleOutline} size="1.5rem" class="text-success"/>
+          {:else if notification.type === 'error'}
+            <Icon path={mdiAlert} size="1.5rem" class="text-danger"/>
+          {:else if notification.type === 'info'}
+            <Icon path={mdiInformationOutline} size="1.5rem" class="text-info"/>
+          {:else if notification.type === 'warning'}
+            <Icon path={mdiAlertCircleOutline} size="1.5rem" class="text-warning"/>
+          {/if}
+        </div>
+        <div slot="title">{notification.message}</div>
+      </Notification>
+    </div>
+  {/each}
+</div>
diff --git a/frontend/viewer/src/lib/notifications/notifications.ts b/frontend/viewer/src/lib/notifications/notifications.ts
new file mode 100644
index 0000000000..e30db017bd
--- /dev/null
+++ b/frontend/viewer/src/lib/notifications/notifications.ts
@@ -0,0 +1,21 @@
+import {writable, type Writable, type Readable, readonly} from 'svelte/store';
+
+export class AppNotification {
+  private static _notifications: Writable<AppNotification[]> = writable([]);
+  public static get notifications(): Writable<AppNotification[]> {
+    return this._notifications;
+  }
+  public static display(message: string, type: 'success' | 'error' | 'info' | 'warning', timeout: 'short' | 'long' | number = 'short') {
+    const notification = new AppNotification(message, type);
+    this._notifications.update(notifications => [...notifications, notification]);
+    if (timeout === -1) return;
+    if (typeof timeout === 'string') {
+      timeout = timeout === 'short' ? 5000 : 30000;
+    }
+    setTimeout(() => {
+      this._notifications.update(notifications => notifications.filter(n => n !== notification));
+    }, timeout);
+  }
+
+  private constructor(public message: string, public type: 'success' | 'error' | 'info' | 'warning') {}
+}
diff --git a/frontend/viewer/src/lib/services/service-provider-signalr.ts b/frontend/viewer/src/lib/services/service-provider-signalr.ts
index 8e2b7812ae..5c4319cb65 100644
--- a/frontend/viewer/src/lib/services/service-provider-signalr.ts
+++ b/frontend/viewer/src/lib/services/service-provider-signalr.ts
@@ -5,7 +5,8 @@ import type { HubConnection } from '@microsoft/signalr';
 import type { LexboxApiFeatures, LexboxApiMetadata } from './lexbox-api';
 import {LexboxService} from './service-provider';
 
-export function SetupSignalR(connection: HubConnection, features: LexboxApiFeatures) {
+const noop = () => Promise.resolve();
+export function SetupSignalR(connection: HubConnection, features: LexboxApiFeatures, onProjectClosed: () => Promise<void> = noop) {
   const hubFactory = getHubProxyFactory('ILexboxApiHub');
   const hubProxy = hubFactory.createHubProxy(connection);
 
@@ -17,7 +18,8 @@ export function SetupSignalR(connection: HubConnection, features: LexboxApiFeatu
   getReceiverRegister('ILexboxClient').register(connection, {
       OnEntryUpdated: async (entry: Entry) => {
           console.log('OnEntryUpdated', entry);
-      }
+      },
+      OnProjectClosed: onProjectClosed
   });
   window.lexbox.ServiceProvider.setService(LexboxService.LexboxApi, lexboxApiHubProxy);
 }