[Zope] Problem to log out from CMF Site

This is another confusing thing for me. I tried to installed CMF and add CMF Site. Everything seemed fine until I tried to log out from the site. I got error message: 'Site Error. An error was encountered while publishing this resource. Error Type: Bad Request error Value: Invalid authentication token' Because I am a zope newbie, I wonder what caused this. How to solve it? I'm using Zope 2.6.0 binary release, linux Mandrake 8.2 , CMF 1.3. Thanks. -- mico@cbn.net.id --- Ph. 62-22-2505549 ICQ #12521756