
I experiment on the users access. I seen your educational videos and they are good; please accept my congratulations on that!
I was on register user access, as you can see in picture 1, and I unchecked the superuser option. I guess that means that super users are no more registered...
Then I had the problem in my back end I cannot see the navigation menu etc. I can see only the k2 component and Jsite map.
I suggest not to do something similar to your site

Thanks in advance,
Angelos