Hi group. Ive noticed a strange problem ever since big sur on imac pro. so when i'm editing a photo in photoshop and open another program over photoshop then switch back to photoshop i'm left with about half of the photo with a grey area covering the photo. I have to zoom in or out for it to go away. heres how it looks. it happens every single time. sometimes it's massive and sometimes its just a small patch. very annoying gremlin in the program.