I also had a similar bug. Symptoms were: 
- the usb printer was correctly listed by lsusb
- gnome-cups-manager didn't auto-detect the printer.
- manual install of a printer had no effect

Solution: delete the line starting with Servername in
/etc/cups/client.conf

Background info: I build a local network, somewhere in the network was a 
cups-server installed. When this server was running, a manual added printer 
resulted in a message like: "password for user root on 192.168.1.34:". When the 
server was shut down, the message was: "IPP request failed with status 1280". 
(remember: When gnome-cups-manager is started from the command line, debug 
information will show on the command line.) It looks like the 
gnome-cups-manager disregarded the cupsys server running on localhost. 
The distrubution in use is: Ubuntu Feisty Fawn, gnome-cups-manager --version 
output gives: "GNOME gnome-printer-view 0.31"

-- 
No network printer added
https://bugs.launchpad.net/bugs/6711
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