I just got Lightroom 6. When I'm importing a RAW file (CR2) all i get is a blue screen with a white cross, not showing me my picture. I can however see a thumbnail of my picture in the top left corner. Makes it hard to edit the picture when I can't see it "full size". Why is this?
Go to Edit > Preferences > Performance, and uncheck Use Graphics Processor.
Having done that, you can try update your graphics driver, which may solve the problem altogether.
But LR runs fine without the graphics processor.
Thank you so much! That fixed my problem!