I've recently had a problem where ONE of my photo albums (not all) has corrupt square preview thumbnails. They look like static images off a TV with no antenna signal, and they ONLY look this way in grid mode. If I switch to filmstrip mode, they are fine. And all of the photos themselves are all fine. It's just the previews for this one album in grid mode. I tried just clearing the photo apps' cache - but no better. Anyone got any other ideas how to rebuild them?