Yesterday I kinda was forced to install the proprietary ATI drivers (ATI Mobility Radeon X600 on my laptop ) for 3D support reasons.
Installed the drivers smoothly, but after restarting X and after a few seconds using the laptop some "glitches" appeared on the lower right corner of my display. Even taking a screenshot it doesn't appear in it.
In the release notes ATI/AMD says: "Corruption may be noticed in the lower right corner of the display after the system is running for a long period of time". This might be true in some situations although my laptop wasn't running for that long...
Digging a bit with Google's help I found an useful tip - adding Option "XaaNoOffscreenPixmaps" "true" (Section Device) in xorg.conf fixes the fglrx bug.
As expected this bug not only affects openSUSE as it affects all Linux distributions, and can be found in the current version (8.443) and version 8.404, at least. I hope this bug gets fixed as fast as possible pushing a new ATI drivers release version out.