Sorry, I forgot to include a couple of facts:
* Linux Red Hat 6.0 running Kernel 2.2.5-15.
* What's up at the '/var/log/cups/error_log' file?
typing a 'lpr afile' command the error_log file shows:
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job 36 queued on 'hp710' by 'root'.
started filter /usr/lib/cups/filters/textID 1032) for job 36
started filter /usr/lib/cups/filters/pstops (PID 1033) for job 36
started filter /usr/lib/cups/filters/cupsomatics (PID 1034) for job 36
started backend /usr/lib/cups/backend/parallel (PID 1035) for job 36
PID 1034 stopped with status 2!
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Is the problem `cupsomatics'?
* The web interface administrator tells me:
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printer state: idle, accepting jobs. (sometimes: 'stopped accepting jobs')
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