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Thats what im doing now, clearing the queue out an restarting cupsd. I'm going to try out what the other guy suggested next time one of them stops. if that want work i might just have to setup ipp on eatch workstation as in his second option. Do not really want to do that since it server will queue up jobs for all users an only have the one queue. with the ipp option it seems you will have a queue on each machine that is setup for i.
I'm not sure if its pdf files here stopping it but it could be since we do use some pdf files here in our online storage system we developed.
On occasion I've had similar problems with certain file types (or other printer driver/hardware problems) hanging up a printer. Usually if you delete the files in tmp and/or the first print job you can restart cups and save the rest of the queued jobs. Doesn't solve the problem but might make your users happier :-) Jeff