I have a Plone 4.3.7 installed using UnifiedInstaller with LDAP plone.app.ldap-1.3.2-py2.7 a couple of yrs in each Plone Sites, I didn't nothing and now any user cannot create anything in Plone Site.
I reviewed all privilages for local zope users and LDAP users even so my output is Insufficient Privileges
[Update 1]
In acl_users/portal_roler_manager show the error MultiplePrincipalError: Multiple groups or users exist with the name 'Administrators'. Remove one of the duplicate groups or users., but in acl_user don't have one or more users with this name_id.