I am already using 22.3 and I previously tried reverting to 22.2 with no success. What I find so puzzling is that the problem disappears when I do a system restart - but I can never open Photoshop after a cold boot. I'm using Photoshop now without any problems. I can quit it and then open it up again and its functions normally. I'll try resetting the preferences - after I have another cup of coffee - and see if that helps.