Disable notification area by default for now because it's not polished enough for the 0.21 release.

src/Gui/DlgSettingsNotificationArea.ui

@@ -29,7 +29,7 @@
          <string>Enable Notification Area</string>
         </property>
         <property name="checked">
-         <bool>true</bool>
+         <bool>false</bool>
         </property>
         <property name="prefEntry" stdset="0">
          <cstring>NotificationAreaEnabled</cstring>

src/Gui/MainWindow.cpp

@@ -394,7 +394,7 @@ MainWindow::MainWindow(QWidget * parent, Qt::WindowFlags f)
 
     auto hGrp = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/NotificationArea");
 
-    auto notificationAreaEnabled = hGrp->GetBool("NotificationAreaEnabled", true);
+    auto notificationAreaEnabled = hGrp->GetBool("NotificationAreaEnabled", false);
 
     if(notificationAreaEnabled) {
         NotificationArea* notificationArea = new NotificationArea(statusBar());