Please turn off the Graphics processor from the Lightroom preferences and check if that helps.
Open Lightroom >> Go to Edit Menu >> Preferences >> Performance >> Uncheck GPU.
Let us know the outcome.
Thanks. I did that long ago but did not help at all.
I checked and unchecked the Graphics processor and restarted LR. So far that seems to have helped. Hopefully you solved my problem. Thank you very much! Gotta love the simple fixes