Hi all, I did have a previous thread about my poor Apple customer service experience but it is long gone now, here is a quick re-cap: - first repair cancelled because of poor communication (told 3 dates on which the repair would be completed, but this was not the case each time.) - Took it in a second time when I had more free time from work, had it away for 10 days and got it back with an Applecare covered bill of £1129 bill as the logic board, display, battery and superdrive were replaced. I have had it back for three weeks now. While working in Motion and Final Cut artefacts slowly started to show up, growing in size and quantity until my screens looked like the image attached. Is this a typical sign of another failing 8600? Or could it be software related as suggested on the phone? It has not happened since, even though I have had Final Cut and Motion open for hours on end again. Thanks in advance for the advice given.