Duplex printing in CUPS

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I am trying to print in duplex mode in CUPS (with an HP LaserJet 5M printer that definitely works in duplexing mode, because I've had it working before), but for some reason nothing comes out double-sided.

I have tried the command

lp.cups -P printername -o sides=two-sided-short-edge

and

lpr.cups -P printername -o sides=two-sided-short-edge

and neither of those work. (I have tried the above two commands with "lp" and "lpr" instead of the .cups versions, and those don't work either.) After those failed attempts, I used lpoptions to set duplexing as the default for this printer

lpoptions -p printername -o sides=two-sided-short-edge

and that fails to work (even though "lpoptions" with no flags shows me that this printer is the default printer and this option is indeed the default option).

I am running Fedora Core 3 (with the CUPS packages cups-1.1.22-0.rc1.8.5, cups-libs-1.1.22-0.rc1.8.5, gimp-print-cups-4.2.7-2), and like I said, I have had this particular printer print in duplex mode fine before. I set up the printer using the gimp-print driver "HP LaserJet 5 series - CUPS+Gimp-Print v4.2.7".

What am I doing wrong?

Thanks,

Jeff

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