did you try to use an older nvidia graphics driver?
I did not for now, as this is my computer at work and now everything is stable, so I do not want to experience around

I just know that I do not have the same problem on a Suse 10.3 with an older nvidia driver and a geforce8800GT.
Bit strange.
Furthermore, this problem does not appear on Ubuntu, with exactly the same machine and the same version of the NVIDIA driver.