I have been looking for an answer to this and all I can find is that my GPU is not working. i have updated my drivers, updated my PC restarted both and I still am having the same issue. I don't think it is the same issue as what people are posting about though. All the blue screen posts I am encountering are a completely Blue box with a cross across it but that is not the issue that i am having. I posted a screen capture of what I am seeing.
Have you tried disabling GPU acceleration? Let us know if that makes a difference.
Edit >> Preferences >> Performance (tab)
Lightroom >> Preferences >> Performance (tab) on Mac OS
Uncheck the box “Use Graphics Processor”
Then click OK
You may try and reset the Lightroom preferences back to default to check if any setting causing this issue in Lightroom.
Let us know if that helps.