[arch-general] Problem with compositing and openGL.

Hello everyone. Well I have problem with my 64 bit system. I have Nvidia 8400GS card with driver installed and enabled (it means that I get glxinfo and glxgears output), but compositing or any 3D games don't work (some openGL error). But at the same time I gan run simple 3D applications like glxgears. Also Nvidia driver starts correctly on startup (logo comes up) and compositing is enabled in xorg.conf. So any ideas on my problem? Might it be a 64 bit system issue? Just to add, under Ubuntu compiz and games worked just fine. Thanks, Verner.