[Zope] Authentication problems with exUserFolder

Hi all, I'm using exUserFolder to authenticate to a Postgres database. With certain clients, however, authentication information is sent only for protected pages. I have a fair amount of information that is available for anonymous users, and I use _['AUTHENTICATED_USER'] to determine whether to place things like "Edit Preferences" and the like on those pages. With Lynx, Mozilla 9.1+, and IE 5.5 (I think) the Basic Auth stuff is only sent for the protected pages. Any ideas on why this is so, and how to fix it? Thanks, -scott