1. From author instance, login as 'superuser' and create a 'testuser' for example.

2. Assign all existing roles to this user --> sample export data: users.system.testuser.xml
3. Logout and try to login with this user --> Nothing happen, we got stuck at login screen.

4. Remove all roles from test user, assign all existing groups to him --> users.system.testuser_all_groups.xml
5. Login to admincentral. Now we can login but cannot see all tools and configuration related apps.