The first thing is that you shouldn't need to empty the Trash folder, it's emptied on a schedule that's set by your Administrator. The default length for mail left in the Trash folder is 30 days then it will remove mail older than that.
Focus should not change from the Trash to Inbox after deleting messages, it should remain in the Trash folder.
You also should be able to right-click on the Trash folder and the 'Empty Trash'.
You can get the version with the following entered in the Web UI search field: $set: get version - you should update your
forum profile with that information (do not post it in this thread).