Hey.
I had this bug twice on OpenBSD, some time earlier and nowadays with 4.3.
First I modified one line in /etc/cups/printers.conf (the one you have bolded):
Code:
DeviceURI file:/dev/ulpt0
It helped some time ago. But not with 4.3, so I removed package and installed cups from ports, of course I've also modfied the line and it works fine...
I'm following stable ports tree.
Good luck.