[Zope] user log-ins not persisting

[David Siedband]

I have a situation where Zope log-ins only seem to be recognized by the 
first page viewed after the user logs in.

I have only been able to duplicate this in Mozilla

I'm using the following if-logic to check if a user is logged in and 
selectively display content.

<dtml-if "AUTHENTICATED_USER.getUserName() == 'Anonymous User'">

For the first page after they authenticate this tests false, yet on 
subsequent pages it tests as true...

Any Ideas on what's happening here?  Much appreciated.

--
David