I have found the following: http://www.nvnews.net/vbulletin/showthread.php?t=43321
Which includes this quote from zander at nvidia:
1.0-6629 is incompatible with some older GPUs; this is a known
problem, and NVIDIA hopes to have it resolved in the next driver
release. Both 1.0-6111 and 1.0-6629 need to be patched to work with
Linux 2.6.10 (Linux 2.6.9+ for 1.0-6111). Please stick to your
working configuration until the problem with 1.0-6629 and your GPU
has been addressed.
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