8800GT and flickering in dark grey areas

Hi,
I have some strange problems with my one week old MacPro and the 8800GT. The system is connected via DVI to a Samsung Syncmaster 223BW.
I noticed that secific shades of dark grey are flickering, much like an old CRT running with 50 Hz.
The problem only occurs in OSX, I were not able to reproduce it in Vista.
Things I tried that didn't work:
- safe boot
- resetting PRAM
- reinstalling OSX
I also moved all the NVIDIA-specific kexts to a different folder and rebooted. This solved the problem but obviously also left me with an unaccelerated system.
Has anybody else encountered this?
Thanks,
Meils

Made no difference what colour profile I used. Does everyone see the same effect on the same pages? Take this movie for example. The effect clearly kicks in about half way through for me...
http://www.needforspeed.com/undercover/media.action?id=Need%20for%20Speed%20Unde rcover%20Trailer-20080825034214033&mediaType=video
Does everyone see the same mad flickering of white blocks?
I am sure this is a driver issue - it's the same sort of thing you see in xp (bootcamp) before you installed the right drivers for the 8800GT.

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