anyone having issues with Preview? Every time you crop a picture a notice comes up: "The file *****.jpg is locked because you havent made any changes to it recently. If you want to make changes to this document, click Unlock. To keep the file unchanged and work with a copy, click Duplicate." A way to stop this? Also, it randomly crashes when cropping some images. Or if it manages to crop a picture the bottom half turns tray on some images.