diff --git a/backend/static/js/app.js b/backend/static/js/app.js
index 44bbf47..c79a63a 100644
--- a/backend/static/js/app.js
+++ b/backend/static/js/app.js
@@ -3,7 +3,7 @@
    Router, State-Management, Navigation, Initialisierung.
    ============================================================ */
 
-const APP_VER = '466'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER = '467'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 
 const App = (() => {
 
diff --git a/backend/static/js/pages/uebungen.js b/backend/static/js/pages/uebungen.js
index dd3bff6..40a8b3c 100644
--- a/backend/static/js/pages/uebungen.js
+++ b/backend/static/js/pages/uebungen.js
@@ -433,17 +433,31 @@ window.Page_uebungen = (() => {
   // ----------------------------------------------------------
   // INIT
   // ----------------------------------------------------------
+  // DB-Kategorien → Tab-IDs
+  const _KAT_TO_TAB = {
+    'grundkommando':   'grundkommandos',
+    'grundkommandos':  'grundkommandos',
+    'trick':           'tricks',
+    'tricks':          'tricks',
+    'problemverhalten':'problemverhalten',
+    'grundlagen':      'grundlagen',
+    'ki-trainer':      'ki-trainer',
+  };
+  const _VALID_TABS = new Set(TABS.map(t => t.id));
+
   async function init(container, appState, params = {}) {
     _container = container;
     _appState  = appState;
-    if (params.kategorie) _activeTab = params.kategorie;
+    if (params.kategorie) {
+      const mapped = _KAT_TO_TAB[params.kategorie.toLowerCase()] || params.kategorie;
+      if (_VALID_TABS.has(mapped)) _activeTab = mapped;
+    }
     _render();
     if (params.name) {
-      // Nach Render + Progress-Load zur Übung scrollen
       setTimeout(() => {
         const card = _container.querySelector(`[data-exercise-name="${CSS.escape(params.name)}"]`);
         if (card) card.scrollIntoView({ behavior: 'smooth', block: 'center' });
-      }, 600);
+      }, 700);
     }
 
     // Progress vom Server laden
@@ -490,7 +504,10 @@ window.Page_uebungen = (() => {
     _renderStatsBanner();
   }
 
-  function refresh() {}
+  function refresh() {
+    if (!_VALID_TABS.has(_activeTab)) _activeTab = 'grundkommandos';
+    _renderContent();
+  }
   function onDogChange() {
     _statsData  = null;
     _badgesData = null;
diff --git a/backend/static/sw.js b/backend/static/sw.js
index b3950ea..f64754d 100644
--- a/backend/static/sw.js
+++ b/backend/static/sw.js
@@ -3,7 +3,7 @@
    Offline-Cache + Push Notifications + Tile-Cache
    ============================================================ */
 
-const CACHE_VERSION = 'by-v489';
+const CACHE_VERSION = 'by-v490';
 const CACHE_STATIC  = `${CACHE_VERSION}-static`;
 const CACHE_TILES   = 'ban-yaro-tiles-v1';  // bleibt über SW-Updates erhalten