[Zope] pcgi authentication

We've got Zope running behind IIS as a pcgi process. Currently we are using the jcntuserfolder product to do authentication, but we are having some trouble. The problem is that we want to allow anonymous connections to our site. So we have the permissions to the zope.pcgi resource set to "allow anonymous" and "challenge response" through IIS. When we try to access the root level "manage" screen in Zope we are getting the manage_menu page in the left frame, but we are getting the index_html document in the right frame instead of the mnage_workspace page.