I have no answer for you, Andrew. Instead, I'm going to piggy-back my question/problem on your thread.
I'm using an APX to share an Epson 740 printer and to provide wireless networking to a laptop. The wireless networking works fine as does AirTunes. However, while all computers (two desktops and a wireless laptop) can see the printer, they can't print to it. A print job will start but will immediately stop without any sort of error.
Any ideas?
P.S. the APX is not distributing IPs.