My Lightroom doesn't seem to show me any previews at all, not even when I try to import pictures. It shows all pictures on my computer in gray. When I try to double click, it's also gray. The only time I can see the picture is in editor mode. I tried deleting the preferences files, restored the cataloge from a backup, tried creating a new catalog, reinstalled lightroom but nothing helped. The error started to happen randomly, I didn't do anything to the program files. Can this be fixed?