Troubles with 9400M only after updates

I've got an Unibody MacBook Pro Late 2008. When I switch to the 9400M GPU I see a lot of distorted elements on the display, as you can see here:
http://www.youtube.com/watch?v=0HlZnW8RmrE
If I switch back to the 9600 everything's ok. I tried to reinstall everything: before installing the updates, just after a clean installation of Snow Leopard, everything's ok with both GPUs. After installing updates display errors begin. So I think it's a software bug.
What can I do? Any idea?
Thank you,
C.

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