I continue to see this problem with the latest driver (9746, I guess).
It is even more annoying, since it happens while browsing, quite reproducible with http://www.imdb.com
(which is pretty bad, I must add).
I'm going to try to disable AGP again, and see the results (I suspect in the previous test I was using NvAGP 1, not NvAGP 0, we'll see...).
I also re-tested the system memory, with no problems reported.
Does anyone know how to test the graphic card memory?
And how to test the AGP?