It's not crashing as long as I have five or less server windows open. Once I make a 6th connection, then hit F11 -> kaboom. It doesn't matter whether I'm actually connected to one of the servers or not.
Fresh install or not doesn't change anything.
I have disabled folders in the Treebar and my Switchbar is hidden. It's only crashing if the child MDI window is maximized.

Does that help?