[Zope] XUF and authentication problem

I am a zope security newbie. I want to limit access to several folders in my website using a postgres table and the extensible User Folder (XUF) product. I've successfully installed XUF. What should the security tab look like on the folders I want to limit access to? I've turned off acquire View permissions and checked View for the Authenticated column. This causes the loginForm of XUF to appear, but typing in a valid username and password doesn't seemt to log me in. Is this problem related to my security tab or does it have something to do with the non-encrypted storage of the passwords in my postgres table (I was using UserDB and a much older version of zope before). Any help would be greatly appreciated. Thanks in advance, Liz