(In reply to comment #48)
> Noticed the same issue in unity (compiz, actually) as soon as the opengl
> plugin is loaded.
> 
> It seems to happen mostly in multi-monitor: http://paste.ubuntu.com/5661055/

FYI, Compiz fix is in
https://code.launchpad.net/~3v1n0/compiz/msaa-configs-ignore/+merge/163550 and
tracked by bug https://bugs.launchpad.net/compiz/+bug/1174495