As mentioned in the subject line, it has happened a few times that at some point, even when the printer has been working, some small change in the parameters or some unknown factor will cause the printer to just stop accepting jobs, or else the system to stop passing them to the printer.
Deja Vu!
I have the same problem with a Brother HL1430. Re-powering the printer and restarting the printer via the CUPS web interface seems to consistently solve the problem. I have a feeeling its something to do with USB, but I haven't had time to look at it.After rebooting, the printer cranked out pending jobs.In another instance, today, jobs sent to the HP printer didn't print. I rebooted, and the copies printed ok. I tried /etc/init.d/cupsys restart, but this didn't work.
Good luck, Rob :)