I've always worked alone on my websites, but today tried to add another administrator. From report of the user and from my own testing of his profile, he is able to see administrator content on the front end, but is denied access to the back end. I'm attaching screenshots that shows the Joomla User Manager seems to be OK, but there is some sort of "Lock" symbol on the CB list that says "Super Users only". Is there a CB setting I don't see?