I have brought this to Tonys attention but, the lateset version since it was beta has been an issue for me. I even did a clean install tonight and it still happens. When I do a defrag, not in Shadow Mode, it literally undefrags my computer until the screen goes blank and I have to hard reboot. I have tried everything but to no luck. Once rebooted it seems to be ok, but defrag and away it goes to a endless loop. Any thoughts. For now I cant use it because of my concern.