Yesterday I decided to buy an abo for LR CC and installed it directly at a WIN 7 computer. I opened it and changed to develop (entwickeln) and the pictures are displayed in a complete wrong way - like the histogramm. I restarted the programme, the computer and de- and reinstalled lightroom, used a new catolgue, imported the picures new - nothing helped.
(on the left you see how the pic should look like)
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
Yes, looks like GPU acceleration. You can turn it off, as reported, it accelerates only with very high resolution screens.