SnakeKiel

I wouldn't call that fixing the problem. Thats like driving slowly when you have a flat tire ;-) ... I have read some opinions that it's rather an Arma problem then a driver problem - can anybody copy that? Or if it's a driver problem: does someone know if there might be an older driver without this problem?

The parameter -winxp is of no help when you are already using XP and not Vista - and Yes, I tried it because I am desperate ;-) ... no change.

I have the same problem with a Radeon X1950, Driver Version 8.591.0.0 / Catalyst which I just downloaded [XP Prof.]. I noticed that this effect will occur after some time. When I quit the game to the desktop with Alt-Tab and return to the game, everything is fine for a while. It doesn't seem to be a heat problem though (its about 72C). And still this effect is not very predictable because I played 1h straight without any effect.