It's a fresh system and install. I'd only installed Windows 8.1, the barebones drivers, graphics card drivers, triplehead2go and Kaspersky Internet Security. If I plug the video direct into a single monitor, I still get the problem. It's odd how it changes though. Sometimes, they are too high and sometimes too low. Could there be a weather effect here? I usually "use real weather". OOOH. I've just switched from clear and dry to the internet download, and the elevators have moved from deflecting up, to deflecting down! Changed it back, and they haven't budged.