I upgraded from LR4.4 to 6 but had made a stop at 5.7 along the way. I upgraded the catalog to v5. Now in LR6, which I ultimately purchased, photos in the develop module are corrupted. I can see them but are mostly grey with some colored highlights. Don't know if this is a catalogue issue or how to repair. All folders appear to be impacted!
Please turn off the Graphics Processor from the Lightroom Preferences.
Go to Lightroom Preferences from the Edit menu
Click on Performance tab
Uncheck the Graphics Processor
Let us know if that helps.
Mohit.. thanks so much. Hunted around and had not found that. I was thinking I had to down the re-installation path. THANK YOU again!