Problem with Nvidia 9600M GT on a UMBP 17"

Hi,

I've got a new unibody macbook pro 17" running 10.5.7. I've realized that when I switch to the NVIDIA 9600M GT graphic card, I've got some few display bugs when I scroll through the menus. It seems that instead of displaying the background through a transparent menu, it sometimes display the plain background. You can see that in the video 9600.mov you can download here.

http://public.me.com/fayard.francois

I've also realized that when I switch in between users, the cube transition is not as smooth as with the 9400M which surprises me. I've tried a 3D game just to be sure everything is OK, and here I finally get better performances with the 9600M than with 9400M.

Do you think that the "menu problem" is related to the card or to the driver ? Do you experience the same bug ?

Francois