Any time you do something in Dressing 2.0, you have to wait for the panels to load. While you are waiting, the text "Please Wait" appears in the top-right corner of the Dressing window (directly to the right of the Subset and View menus). This wait indicator also shows up when you click the Save Avatar, Undo Changes, and Undress buttons. When the wait indicator goes away, any action you selected from one of these buttons is done, even if the panels didn't appear to update, as is the case with the Save Avatar button.