CUPS at localhost

Hello. I am have been trying to learn a bit more about CUPS and while reading though the SUSE Pro v9.1 Admin Guide came across the note regarding the CUPS web interface. I can fire up the interface (http://localhost:631/) and can use it just fine unless I attempt to perform Administrative Tasks. When I click on the 'Do Administration Tasks' link I am presented with a standard credentials dialog. I enter 'root' and the root password, but all I get is an authentication failure box with 'try again' and cancel buttons. I know I am entering the root password correctly. Has anyone else experienced this behaviour with the CUPS web interface, or perhaps know how to fix it? Thanks. Jesse