When using <alt><tab> to switch between windows the graphical display of the windows will jump over to the left after a second or so. It's really distracting. My hardware is http://smolt.fedoraproject.org/show?UUID=370851dd-7222-42a6-a498-7183483ea8df compiz-0.5.2-11.0ec3ec.fc8
I can no longer reproduce this.