After to upgrading to Leopard, I am no longer able to access my remote USB printer, which is connected to an Airport Express. I have reset the base station and it rejoins my network with no problems. But although my Canon MP780 shows up as a Bonjour printer, trying to add it fails to "client-error-not-authorized". A quick Google indicates this is a CUPS error message, but all the fixes are for Linux distributions. Any ideas how to resolve this on OS X?