[Zope] about Zope 2.8.6

Hello! I have a question about Zope. I'm using Zope 2.8.6-final, python 2.3.5 and Plone 2.1.2. I'm trying to show an event in the portal calendar (CMFCalendar 1.5.5). This event has a custom workflow. I've configured the states in /site/portal_calendar/ ,configure tab, but the calendar doesn't show my event. I have done this experiment with Zope 2.8.1-final and it works well. Is there any problem with Zope 2.8.6 and the CMFCalendar 1.5.5? TERRA -->