OP reported similar problem using nvidia drivers, even though I have the same problem using fglrx.
Several users reported that enabling display compositing works to stop the artifacts, I can confirm this on Debian Wheezy.
The problem was apparently fixed on Oneiric's release, which is good. I suppose this can be marked as closed?
Sorry for the double post, not sure how to use launchpad yet. Anyways,
possible duplicate found: https:/ /bugs.launchpad .net/ubuntu/ +source/ xfce4-terminal/ +bug/777606
OP reported similar problem using nvidia drivers, even though I have the same problem using fglrx.
Several users reported that enabling display compositing works to stop the artifacts, I can confirm this on Debian Wheezy.
The problem was apparently fixed on Oneiric's release, which is good. I suppose this can be marked as closed?