I'm using lightroom cc 2015.5 on windows 7 for this specific issue, but I also run lightroom 5.7 at home on a mac that doesn't have this issue.
When I'm in library mode, the pictures look fine. When I switch to develop mode, the same picture looks like the attached screenshot. Also, the images load much slower than I would expect for a quad-core i5 @ 3.1 GHz box. I've tried to update LR but the 'updates' option in the help menu is grayed out - I'm not sure what that means.
Any help would be appreciated!
Got to Edit > Preferences > Performance, and uncheck Use graphics processor.
Lightroom preferences->performance tab->uncheck the GPU option.
Awesome. That worked perfectly and solved the image issue and the speed issue. Thanks!