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As Todd suggested, turn off the evil OpenGL. You might also look at some of my thoughts on the matter here: http://aeerrors.myleniumstuff.de/?p=750 . It's surely incomplete and some guess work, but may help. If you have any ideas and resolutions, let us know. I'd gladly include it in the page so other users may benefit from it in the future.
and maybe avoid subjects like
> After effects cs4 problem.
makes absolutely no sense at all.
> As Todd suggested, turn off the evil OpenGL.
next thing that makes no sense at all. what Open GL is the hell good for? I never used it personally because it always did something unexpectable. Hate it!
OpenGL can really help to accelerate rendering for previews when you're working with a lot of 3D layers. I leave it off until I'm moving and animating items in a 3D scene; then I turn it on. OpenGL is dependent on GPU hardware, which is very variable, so your success with it may vary greatly.
For more information, see the "Render with OpenGL" section of After Effects Help.
Thank you so much everyone I disabled OpenGL and now I can scroll through my composition. It's weird it does not work though since I think I have the most powerful graphics card available for laptops for the moment. Hope this will last now.