[Zope] LDAP User Folder Problems

Ok, so I've HUGE problem with the LDAP User Folder I am using the LDAP User Folder to restrict access to a directory to only users that can authenticate against LDAP. This, I thought, was working fine. Then I noticed that if I tried to login successively I no longer required the correct password. Checking the log file, the user is cached. So, when a user is in the authenticated cache, anyone can login with that username and a gibberish password. Anyone with thoughts on this subject? Edward