I've just installed OpenSUSE 12.2 Gnome (32 bit) in VirtualBox 4.2.4 on Windows 7 64 bit host. After first boot I've had Gnome not able to start, so I've removed OpenSUSE Vbox guest additions and successfuly compiled/installed Oracle guest additions (4.2.4) that seems to have fixed the problem. 3d support is enabled.
But another problem: when I switch to Full-screen, screen seems not to refresh until I get my mouse to Activities button, (Activities menu works OK, Application menu does not refresh also.

In windowed mode all seems to work OK.

Host GPU is Intel HD 3000. (I have dedicated nvidia 640M card, but if I tell Virtualbox to use that, gnome does not start at all, and I have no Idea how to fix that).

Anyone with similar problem, any fix or workaround?