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I've experienced the very same problem with 9.1.
My solution was to log on to the cups server via any browser (http://servername:631/printers, and to restart the printer. So queued jobs were not lost. I don't have an explanation as to why this is happening, and also find that it should not happen.
Thanks to all for the suggestions on fixing cups problem. I will try an log onto the cups server an restart the printer next time now that I know how to do it an have a log in setup for lppasswd. I running our server on a backup machine now since i had a hardware problem with our raid array an am rebuilding the server at this point. will try 9.2 on the new machine if we do not choose to go with suse enterprise server 9 on it. again thanks to all jack