@thewildrover I read through your forum thread here:
https://support.gentlemencoders.com/forums/topic/crop-causes-blank-preview-bug/
I believe my problem is similar to what you reported with the exception that I am experiencing this on a Mac. The corruption manifests as a totally blank preview or image, partially blank image or preview or as a “psychedelic” preview or image from time to time as well.