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Make certain there are no spaces in the file name and not odd characters like @ and #. If neither of these appears to be the cause of the failure, open the image in an image editor on your computer and save it again. Perhaps lightroom gives some conflicting information within the file about the kind of file it is and the PHP-Fusion image check function will pick that up and consider uploading the image to be a security risk. In the past hackers tried to have virus en worm files masquerading as image files uploaded to sites.