[xwiki-users] xwiki access rights without group

hi there, just upgraded to 6.0.1 from 5.4.4 and now experiencing weird permission behavior, new added users via ldap has no rights to access the main page, but can create spaces and even edit the main page without being in any group at all adding them to a group or giving the user admin rights does not change anything. already tried to: having the user isolated in a own group, granting the user admin rights, CheckProgrammingRights with the admin script, reinstalling the main ui core extension, but nothing seams to help there are no users in the allgroup and the allgroup has no permission active. adding the user to that group or adding permission to that group did not change anything... meanwhile installing the 6.0.1 fresh on a debian to start debugging ... best regards