diff --git a/backend/src/middleware/rbac.middleware.ts b/backend/src/middleware/rbac.middleware.ts
index 1b284cc..974a45e 100644
--- a/backend/src/middleware/rbac.middleware.ts
+++ b/backend/src/middleware/rbac.middleware.ts
@@ -63,6 +63,16 @@ const PERMISSION_ROLE_MIN: Record<string, AppRole> = {
   'bookings:delete': 'admin',
 };
 
+/**
+ * Derive an AppRole from Authentik JWT groups (highest matching role wins).
+ */
+function roleFromGroups(groups: string[]): AppRole {
+  if (groups.includes('dashboard_admin')) return 'admin';
+  if (groups.includes('dashboard_kommando')) return 'kommandant';
+  if (groups.includes('dashboard_fahrmeister') || groups.includes('dashboard_zeugmeister')) return 'gruppenfuehrer';
+  return 'mitglied';
+}
+
 function hasPermission(role: AppRole, permission: string): boolean {
   const minRole = PERMISSION_ROLE_MIN[permission];
   if (!minRole) {
@@ -116,24 +126,16 @@ export function requirePermission(permission: string) {
       return;
     }
 
-    const role = (req.user as any).role
+    const dbRole = (req.user as any).role
       ? (req.user as any).role as AppRole
       : await getUserRole(req.user.id);
+    const groupRole = roleFromGroups(req.user?.groups ?? []);
+    const role = ROLE_HIERARCHY.indexOf(groupRole) > ROLE_HIERARCHY.indexOf(dbRole) ? groupRole : dbRole;
 
     // Attach role to request for downstream use (e.g., bericht_text redaction)
     (req as Request & { userRole?: AppRole }).userRole = role;
 
     if (!hasPermission(role, permission)) {
-      // Fallback: dashboard_admin group grants admin:access
-      if (permission === 'admin:access') {
-        const userGroups: string[] = req.user?.groups ?? [];
-        if (userGroups.includes('dashboard_admin')) {
-          (req as Request & { userRole?: AppRole }).userRole = 'admin';
-          next();
-          return;
-        }
-      }
-
       logger.warn('Permission denied', {
         userId: req.user.id,
         role,
diff --git a/frontend/src/components/chat/ChatPanel.tsx b/frontend/src/components/chat/ChatPanel.tsx
index 02b68fd..97aaab2 100644
--- a/frontend/src/components/chat/ChatPanel.tsx
+++ b/frontend/src/components/chat/ChatPanel.tsx
@@ -49,16 +49,20 @@ const ChatPanelInner: React.FC = () => {
   // Mark unread rooms as read in Nextcloud whenever panel is open and rooms update
   React.useEffect(() => {
     if (!chatPanelOpen) return;
-    rooms.filter((r) => r.unreadMessages > 0).forEach((r) => {
-      nextcloudApi.markAsRead(r.token).catch(() => {});
+    const unread = rooms.filter((r) => r.unreadMessages > 0);
+    if (unread.length === 0) return;
+    Promise.allSettled(unread.map((r) => nextcloudApi.markAsRead(r.token))).then(() => {
+      queryClient.invalidateQueries({ queryKey: ['nextcloud', 'rooms'] });
     });
-  }, [chatPanelOpen, rooms]);
+  }, [chatPanelOpen, rooms, queryClient]);
 
   // Mark the selected room as read when a conversation is opened
   React.useEffect(() => {
     if (!selectedRoomToken) return;
-    nextcloudApi.markAsRead(selectedRoomToken).catch(() => {});
-  }, [selectedRoomToken]);
+    nextcloudApi.markAsRead(selectedRoomToken).then(() => {
+      queryClient.invalidateQueries({ queryKey: ['nextcloud', 'rooms'] });
+    }).catch(() => {});
+  }, [selectedRoomToken, queryClient]);
 
   if (!chatPanelOpen) {
     return (
diff --git a/frontend/src/pages/AdminDashboard.tsx b/frontend/src/pages/AdminDashboard.tsx
index 867c642..842522d 100644
--- a/frontend/src/pages/AdminDashboard.tsx
+++ b/frontend/src/pages/AdminDashboard.tsx
@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react';
 import { Box, Tabs, Tab, Typography } from '@mui/material';
-import { Navigate, useSearchParams } from 'react-router-dom';
+import { Navigate, useNavigate, useSearchParams } from 'react-router-dom';
 import DashboardLayout from '../components/dashboard/DashboardLayout';
 import ServiceManagerTab from '../components/admin/ServiceManagerTab';
 import SystemHealthTab from '../components/admin/SystemHealthTab';
@@ -24,6 +24,7 @@ function TabPanel({ children, value, index }: TabPanelProps) {
 const ADMIN_TAB_COUNT = 6;
 
 function AdminDashboard() {
+  const navigate = useNavigate();
   const [searchParams] = useSearchParams();
   const [tab, setTab] = useState(() => {
     const t = Number(searchParams.get('tab'));
@@ -47,7 +48,7 @@ function AdminDashboard() {
       <Typography variant="h4" sx={{ mb: 3 }}>Administration</Typography>
 
       <Box sx={{ borderBottom: 1, borderColor: 'divider' }}>
-        <Tabs value={tab} onChange={(_e, v) => setTab(v)}>
+        <Tabs value={tab} onChange={(_e, v) => { setTab(v); navigate(`/admin?tab=${v}`, { replace: true }); }}>
           <Tab label="Services" />
           <Tab label="System" />
           <Tab label="Benutzer" />
diff --git a/frontend/src/pages/AusruestungDetail.tsx b/frontend/src/pages/AusruestungDetail.tsx
index 3bc9091..d7861d5 100644
--- a/frontend/src/pages/AusruestungDetail.tsx
+++ b/frontend/src/pages/AusruestungDetail.tsx
@@ -159,8 +159,8 @@ const UebersichtTab: React.FC<UebersichtTabProps> = ({ equipment, onStatusUpdate
       await equipmentApi.updateStatus(equipment.id, payload);
       setStatusDialogOpen(false);
       onStatusUpdated();
-    } catch {
-      setSaveError('Status konnte nicht gespeichert werden.');
+    } catch (err: any) {
+      setSaveError(err?.response?.data?.message || 'Status konnte nicht gespeichert werden.');
     } finally {
       setSaving(false);
     }
diff --git a/frontend/src/pages/FahrzeugDetail.tsx b/frontend/src/pages/FahrzeugDetail.tsx
index d1a1251..ce22948 100644
--- a/frontend/src/pages/FahrzeugDetail.tsx
+++ b/frontend/src/pages/FahrzeugDetail.tsx
@@ -153,8 +153,8 @@ const UebersichtTab: React.FC<UebersichtTabProps> = ({ vehicle, onStatusUpdated,
       await vehiclesApi.updateStatus(vehicle.id, payload);
       setStatusDialogOpen(false);
       onStatusUpdated();
-    } catch {
-      setSaveError('Status konnte nicht gespeichert werden.');
+    } catch (err: any) {
+      setSaveError(err?.response?.data?.message || 'Status konnte nicht gespeichert werden.');
     } finally {
       setSaving(false);
     }
diff --git a/frontend/src/pages/Kalender.tsx b/frontend/src/pages/Kalender.tsx
index a9fc4b6..a0f30f0 100644
--- a/frontend/src/pages/Kalender.tsx
+++ b/frontend/src/pages/Kalender.tsx
@@ -2158,7 +2158,7 @@ export default function Kalender() {
         {/* Tabs */}
         <Tabs
           value={activeTab}
-          onChange={(_, v) => setActiveTab(v)}
+          onChange={(_, v) => { setActiveTab(v); navigate(`/kalender?tab=${v}`, { replace: true }); }}
           sx={{ mb: 2, borderBottom: 1, borderColor: 'divider' }}
         >
           <Tab icon={<EventIcon />} iconPosition="start" label="Dienste & Veranstaltungen" />