Have you installed any new software? I have some sort of profile problem on my laptop that I haven't been able to solve. So I understand these mystery display issues. On my laptop it's like there's a profile that's either being used on top of another one or not being used somewhere. But I don't know how to track down and isolate the problem. The result is I don't trust my laptop for setting up photos. It's really a bummer when I'm on the road.