[Zope] EventFolder 1.3 problem

Hi, I installed EventFolder 1.3 on a ZOPE 2.3.3 site. When I try to post a new event a password-message pops up and I cannot add the event: (Object: EventDocument_add) Unauthorized: title I looked at the EventFolder FAQ, but all _add methods do have the manager proxy role. I tried to add an event as a manager from the managing screens as well as a "user" of the site. What is going wrong? All comments are highly appreciated! Regards, georg