Comment 62 for bug 838577

I agree with David Lopez:

For me, the problem also persists when installing fonts-cantarell. Mostly, drop-down menus and tooltips are totally corrupted. Scrolling is worse than with the open driver. But 3D effects are far smoother. From time to time the screen flickers completely. Overall, gnome-shell is unusable.

Also using Ubuntu 11.10 64bit and and fglrx 2:8.881-0ubuntu4.1. I tried the newest driver from the ATI website (11.10) and it doesn't fix the problem. Additionally, there are module loading problems with this version. But I think, this should be another bug.