I upgraded to LR 6 from LR 5.7 and since, many photos won't display in the Develop Module. Many of the functions do work, but there is no photo displayed, only grey screen. In the crop function, the photo displays but is out of proportion. I am using a PC with Windows 10. Any suggestions? LR 5.7 worked.
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
Thanks, but this did not resolve the problem. After a little more troubleshooting, I found that the more recent pictures, apparently imported and edited in LR and later can be displayed in the develop module. Could this be a catalog update problem when LR 6 converted the previous catalog file? If so, how can this be corrected?