Comment 18 for bug 498995

I only see 5 people affected by this bug commenting about it, and 10 total. Thus it does not seem to affect many users.

Additionally, some users report an easy fix (for Compiz) or report that it does not happen all the time (and thus a restart would fix it).

So far no user has given us information that can help us track the problem and the devs are not experiencing the problem (note: the devs use Compiz).

My guess is any Compiz user with this problem has done something (loaded a Compiz plugin, set a weird setting, who knows!) that broke it. My only hint for those users is to disable all Compiz plugins and reset all Compiz settings to default, and go from there.