Lark,
I have the same problemn - use ATI HD7970. Dont find any paliative.
In CloD Ubi german forum, a guy say something abouth how address this problemn in ATI cards, published in December issue of Games Hardware magazine (in german), but no details.
Look at post # 8
http://forums-de.ubi.com/showthread....rtr%C3%A4glich
Sokol1