My account that I created initially shows up in the list of administrators on the user control panel. It shows as being in the "Registered" group, with "Administrative" and "Moderator" additional groups.
The new account is the same, but does not show up in the list of administrators on the user control panel. There's a "make this user an administrator" button, but that just redirects to the list which does not contain the user. There's a "create a new administrator" option, but that looks like it wants to make a new account?
... no, apparently that is not creating a new account, it's creating a new being-an-admin for an existing account. So that's separate from membership in those groups, I guess? I am confused.