manage_editForm = DTMLFile('dtml/editForm', globals())
security.declareProtected('View management screens', 'manage')
manage_main = manage_editForm
Could this be an "Internet Explorer failing to pass the AUTH info" problem?
It sounds as though you are getting access to the edit tab via Anonymous permissions (Have you restricted access to the manage_main method using the __permissions__ settings)? In that case, Zope will not show you the other tabs because the Anonymous User is not allow to see them.