I ran an update after installing the OpenSuse 11.2 Gnome Live CD and could not start Gnome.
Signing in would only get me a blank screen with wallpaper.
Changing the display manager in /etc/sysconfig/displaymanager to kdm (from the default gdm) resolves this issue for me:
DISPLAYMANAGER=“kdm”
I’m not sure if anybody else has run into this issue, but that was my solution.