Click on Edit - Preferences - Performance and uncheck use graphics processor.
Thank you so much I really appreciate I just di it and it worked. thank Again!
Hi, I seem to be having the same problem. Just started today. I tried going into edit - preference - performance, but could not find performance anywhere so could not check to see if graphic processor was checked to uncheck it. The problem I am having is when I go into develop mode the picture goes grey when I try to make adjustments. You can see the adjustments on the strip on the bottom but there is nothing where the picture typically is except a grey screen. Also, when I go back to library and then go back into develop mode the picture is there but it is blurry. Can you make any suggestions how to correct this? I should mention that I am using Lightroom 5 (with all the updates). I also have Windows 10.