Authentication issue with CUPS 5.3.1 on SMB Printer

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http://askubuntu.com – I am trying to print to a samba printer via CUPS. I have configured the printer allright, but there seems to be a problem with authentication. The error message I get is "Session setup failed: NT_STATUS_LOGON_FAILURE" The GUI also tells me: Idle - Tree connect failed (NT_STATUS_ACCESS_DENIED) It used to work with previous versions of CUPS (1.4.3 and 1.4.6) under Ubunto 11.04 I am doing this on a clean install of Ubuntu 12.04, CUPS version 1.5.3. I have tried changing some rights relating to apparmor, with no success as described here: http://www.compdigitec.com/labs/2010/01/16/fixing-usrli (HowTos)