diff --git a/public/js/app.js b/public/js/app.js
index 15d617a..d2b5790 100755
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -5293,13 +5293,10 @@ class SoundManager {
 
     constructor() {
         this.channels = {};
-        console.log("SoundManager construction");
         if ('AudioContext' in window){
-            console.log("SoundManager construction 2");
             this.context = new AudioContext();
         }
         else if ('webkitAudioContext' in window){
-            console.log("SoundManager construction 3");
             this.context = new webkitAudioContext();
         }
         else {
@@ -5312,9 +5309,16 @@ class SoundManager {
             console.log("onComplete from context", arguments);
         };
 
-        window.addEventListener("visibilitychange", () => {
+        window.addEventListener("visibilitychange", (e) => {
+            console.log("visibility Change event", e);
             this.handleVisibilityChange();
         });
+         //For safari
+        let checkVisibility = ()=>{
+            this.handleVisibilityChange();
+            setTimeout(checkVisibility, 500);
+        };
+        checkVisibility();
     }
 
     isNotSuspended(){
@@ -5431,6 +5435,7 @@ class SoundManager {
     }
 
     handleVisibilityChange() {
+        console.log("handling visibillity change...");
         if (document.hidden) {
             this.stopAll();
         }
@@ -7555,6 +7560,7 @@ class WordRotatorSettingFragment extends LocalStorageSettingsFragment {
             localStorage.removeItem("levelCounter");
             localStorage.removeItem("tutorial-step");
             (await WordRotatorDb.getInstance()).removeAll(WordRotatorDb.OBJECT_STORE.LEVEL);
+            (await WordRotatorDb.getInstance()).removeAll(WordRotatorDb.OBJECT_STORE.SYSTEM_VARS);
         });
 
         if (location.hostname.includes("beta") || location.hostname.includes("127.0.0.1")) {
@@ -7860,8 +7866,6 @@ InitPromise.resolve(app$1).then(async function () {
     app$1.start(MenuSite);
     Translator.setLanguage("de");
 
-
-
     InstallManager.setCanInstallListener(e => {});
     let storageManager = MyStorageManager.getInstance();
     if (InstallManager.isInstalled()){
@@ -7871,7 +7875,7 @@ InitPromise.resolve(app$1).then(async function () {
     window["applyAndroidBridge"] = AndroidBridge.applyDefinitions;
 
     let wasOpened = (Helper.nonNull(localStorage.getItem('was-open'), "0") === "1");
-    if (wasOpened){
+    if (wasOpened && storageManager.canPersist()){
         Promise.all([storageManager.isPersistent(), navigator["serviceWorker"]["ready"]]).then(res => {
             if (!res[0]){
                 FlashMessenger.addMessage("warning-data-not-persistent");
diff --git a/src/js/lib/pwa-assets.js b/src/js/lib/pwa-assets.js
index 0e9599a..eb939dd 100755
--- a/src/js/lib/pwa-assets.js
+++ b/src/js/lib/pwa-assets.js
@@ -440,13 +440,10 @@ class SoundManager {
 
     constructor() {
         this.channels = {};
-        console.log("SoundManager construction");
         if ('AudioContext' in window){
-            console.log("SoundManager construction 2");
             this.context = new AudioContext();
         }
         else if ('webkitAudioContext' in window){
-            console.log("SoundManager construction 3");
             this.context = new webkitAudioContext();
         }
         else {
@@ -459,9 +456,16 @@ class SoundManager {
             console.log("onComplete from context", arguments);
         };
 
-        window.addEventListener("visibilitychange", () => {
+        window.addEventListener("visibilitychange", (e) => {
+            console.log("visibility Change event", e);
             this.handleVisibilityChange();
         });
+         //For safari
+        let checkVisibility = ()=>{
+            this.handleVisibilityChange();
+            setTimeout(checkVisibility, 500);
+        };
+        checkVisibility();
     }
 
     isNotSuspended(){
@@ -578,6 +582,7 @@ class SoundManager {
     }
 
     handleVisibilityChange() {
+        console.log("handling visibillity change...");
         if (document.hidden) {
             this.stopAll();
         }