I've read a lot about solutions to this but none have worked for me. Several of my pictures have suddenly turned green, imagine underwater images and you'll picture what I mean. Not all images in my library or even all images in one project, but one by one they seem to be changing. I repaired the db and it fixed the problem, but then they turned green again. Rebuilt the db, no joy. Recreated the previews, still no joy. running 3.3.2.