HB> OK, this sucks. It's getting to me like that too.
the biggest source of information is your /var/log/Xorg.0.log
less it and look for "dri" lowercase.
You're looking for something 3/5 to 4/5 from the end of the log. It should say either DRI succeeded, or dri failed.
If it says, failed, it should say something about why.
you may also want to re-emerge ati-drivers
then issue a :
opengl-update ati
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