Drag selecting a large number of items caused them to reorder in Outline panel.
I am creating a modal dialog that has a number of states. I created all the individual labels, buttons, etc and then created a Dynamic panel so that I could move the dialog into it. When I drag selected all the items and tried to move them, the order of items changed (i.e what displays on top and then in the layers below it). At first I thought that I had accidentally deleted some of the items, but then when I looked at the Outline panel, I realized that some of the items were moved to a layer below my background (which is not transparent).
Every time that I select many objects it seems to do this. It is pretty annoying to have to reorder all my items every time I select many items.