Corrupted display with ATI 10.6 drivers

[Matteo Riva <muradin@gmail.com>]

I installed ATI proprietary drivers version 10.6 and, while I can get
the system to work, it becomes corrupted quickly.

Example of corruption: while cycling through Iceweasel's open tabs,
parts of them become all black, or white, elements disapper and reappear
when mouseovered, etc.

I'm using the xorg.conf created by aticonfig --initial
xorg version 1.7.5+6

Any particular option I can use to fix this problem?

Thanks.