There are a number a problems regarding the User Management.
1. Can't know which are the real permissions of users in BU or System. It's essential that a listing of users, referring which are their unit access and level 2. The user interface is quite awkward... sometimes we can change, sometimes i can't.
Example:
2 BU, want to give access to both... can't do, must be one BU at a time. Give permission to first BU no problem. Second BU, trying to set user permission no go. Must remove login, and grant login with the permission!!!