I have 11.10 installed and have deactivated the Compiz animated effects, but have turned on wobbly windows. So, in short, windows don't fade / slide / etc, but they wobble.
I can't find a pattern, but it seems that while I am working for a few hours, the wobbly windows suddenly stop being wobbly for no reason. Only on some windows, mind you.
It's obviously not expected behaviour...