[xwiki-users] help to migrate from xwiki 2.3

Hello all, I finally got new environment to migrate our 'old' Xwiki 2.3 to 6.1 (oracle 11, tomcat 7,...). Fresh install is good When I migrate the db from 2.3 to 6.1, everything seems ok but not when I import the default xar 6.1. After import, every users have rights to see admin menu (in home) and have access :/ (users don't have admin rights of course) Any idea how I can fix this? Do I have to migrate to intermediate version before the 6.1? Patrick