When generating .jpg files with imbedded printer profiles in the Print Module (Print Job: Print to JPEG file) to send to my off-site lab, there is no thumbnail on the files. If I inspect the files with "get info", it displays the image size "0 x 0 pixels", however the files are full size (12-18 MB) and readable by the lab after I up-load them. On my computer I cannot view them with the standard Preview app and I get a message of possible damaged file or a format that the Preview app doesn't recognize. I was having the same issue with LR 3 for the last couple of months and thought that upgrading to LR 4 might solve the problem. I reinstalled Mac OS 10.7.3 Lion hoping that might also solve the problem. If I create a .jpg file from the export command in the Library Module, everything is OK. It is only with the Print Module.
Has anyone had a similar problem? Is there a setting somewhere that might have accidentally changed. Anyone have any suggested solutions?
Alternately, does anyone know of an app to rebuild the thumbnail from the main .jpg file?