Bug#698504: system-config-printer: permission problem though added to lp group

[Claudio Laurita]

I can confirm this bug in debian wheezy 32 bit too (with mate 1.6.0 
desktop, kernel 3.11 i386).
system-config-printer version 1.4.3-1
cups 1.7.1-2

user is member of group lpadmin (tried also with lp, anyway)
To manually add a printer, user has to give su credentials.
system-config-printer-udev doesn't add automatically a new usb printer 
until user goes into system-config-printer and gives su credentials.

Claudio