I've opened multiple files in Preview and have found that be it .pdf, .tiff, or jpg, all have crop disabled. I'm not sure how that happend, if it is the file versions that do not allow crop (which would seem odd), or if I triggered something in the app somewhere that disabled it. Has anyone else noticed crop not working? If crop is working for you in 10.8, can you upload the image you can crop so I can try it on mine? Thank you!