Ensure, that user switching back using the task switcher also must have

accounts

src/eu/alefzero/owncloud/ui/activity/LandingActivity.java

@@ -73,6 +73,15 @@ public class LandingActivity extends SherlockFragmentActivity implements OnClick
 		}
 	}
 
+	@Override
+	protected void onRestoreInstanceState(Bundle savedInstanceState) {
+		super.onRestoreInstanceState(savedInstanceState);
+		// Check, if there are ownCloud accounts
+		if(!accountsAreSetup()){
+			showDialog(DIALOG_SETUP_ACCOUNT);
+		}
+	}
+
 	@Override
 	protected Dialog onCreateDialog(int id) {
 		Dialog dialog;