I'm getting the exact same problem here, with an HP5000. It looks like a
seperate port is going to be needed for ESP Ghostscript for this version.
http://www.cups.org/ghostscript.html
Alan is working on this one now, and we'll hopefully see a fix soon for this.
Upgrading my cups to 1.1.15.1 (through ports) seems to have broken my
printing. I now get errors like
I [18/Jul/2002:21:54:51 +1000] Job 325 queued on 'Stylus' by 'marauder'.
E [18/Jul/2002:21:54:51 +1000] Unable to convert file 0 to printable format for job
325!
in the logs.