Comment 69 for bug 353126

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charly4711 (karl-h-beckers) wrote : Re: Compiz / vnc screen refresh with nvidia-restricted driver/VirtualBox/ATI fglrx driver

Judging from the suggested workaround, I wouldn't at all be surprised, if this was caused by this:
http://lists.freedesktop.org/archives/compiz/2008-May/003125.html