The problem is that I think I have been getting tree artifacts with Iclone 6. It wasn't bad and didn't appear to show up in render. Since I went to ic6 it always looked like something was moving on highly treed scenes even though I was not playing the animation. The changes in the video drives has made it unusable but I really don't like using old drives especially using subsequent releases seems to make it worse. It appears to be something the way iclone 6 does the old trees. As I said if I use the new trees in the sampler I don't get any artifacts.