We had a problem yesterday where we duplicated an imposition from a previous job and updated the 4 page document with a newer approved version. The job ripped and rendered correctly (showed the updated PDF file correctly) but when it got time to plate it, it somehow picked the previous version's PDF file and used it instead. Not sure how this is even possible but wondered if anyone here has encountered such a problem? We have to use process-less plates so we cannot do a thorough examination before it get's to press like most shops can, so it made it to the press and through the whole shop. Customer caught the mistake.