Licaon, can you please supply an nvidia-bug-report so that I can check your system configuration. Thanks.
Also, if you have an MCP61/MCP68 chipset with AMD CPU, perhaps you could try the patched driver in this thread:
(see comments 41 and 49)
One final note: NVIDIA is currently recommending users not use the version of the driver that you currently have, and that the patched driver I mentioned above is based on; see http://www.nvnews.net/vbulletin/announcement.php?f=14
. Perhaps try downgrading the driver and see if this problem is solved?