Can't move Administrators to Authorized Administrators

Hi !

We've just installed PMP Premium and imported users from our LDAP and configured the LDAP-Auth. We would like to use the Access Control Workflow to regulate the access to our Emergency-Passwords. We've created a new ressource for the Emergency Password and tried to configure the Access Workflow for it. When we now click on "Configure Access Control" the new windows appears but we can't Move Administrators from the left table to the "Authorized Administrators" in the right table.But it is possible to move a user from the left table to the excluded users table on the right.

I've tried IE, Firefox and Chrome. All the same problem.