Hi all I have such problem: I have pure installation of XWiki with imported the default XAR, which is offerred after installation. When I log in ad Administrator, I cannot add new user in admin pages - i get only empty screen after click on "Add user". I cannot add user to group too - i Cant select any user. New group was created sucesfully. Any experiments with permissions (even enable all permissions for all groups/users including ungegistered) was unsuccessfull. Thanks for any pointer.