Fighting with WordPress MU Permissions

Hello!
well I don't know, but I had problems with Word Press in this month that I don't had in my entire life. :slight_smile:
Anyway, I have a network. In my main site, I created a new role called "Designer" and gave it permissions to access and manage everything, except of users-related permissions.
Unfortunately, I can't access to some pages with this user now, such as my theme controll panel, custom press settings, and some other plugins settings too.
The error I see is: "You do not have sufficient permissions to access this page"
I updated the Designer role and gave it all permissions to see if I can solve the problem, no luck.
I created a new user with administrator role, but also I couldn't manage to fix this weird problem.
The only solution I know to solve this problem is to make this user super administrator, which is not an option as you know.
I'm waiting for your help, thank you in advanced.