Re: Video playback corrupted
i have the same problem, no compiz, however compositing is enabled.
i found that starting a new (additional) X session will also fix the problem, for example, i play WoW in a separate X session as cedega does not like xinerama, and as soon as i start that session, and then switch VTs back to the first one, the problem is no longer present.
this workaround, however, does not permanently fix the problem, it returns with no predictable pattern.
i'll post a bug report if i get time.