EvilDragon,
sorry to revive this thread. I experienced GUI distortion similar to what described on 2 computers. Just want to make sure, this is what people are talking abut. It (Kontakt GUI) starts sharp, but under load (pressing buttons) it becomes suddenly distorted for some seconds, then goes back to normal.
If this is a known issue, it's strange they didn't address it in several months...
P.S. I was trying to record screen, but after I watched it, it seems normal., it seems some kind of overlay thing.