I have exactly the same issue at one of my clients. They print to a follow me queue, go to the machine and release their jobs, some just vanish, others print. Nothing in Papercut logs or the copier for the jobs that vanish. Any one with any idea would be great. They reprint the job to the same queue and it prints but being a big school are getting a bit fed up now. Regarding your trial license expired, try reinstalling over the top of current install, heard it will give another 40 days
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14.3 now, much better