title: TFS 2012 add member disabled under group membership
body: <p>I am using TFS 2012 Server Administration Console to manage group memberships for different team projects. However, it seems that after recent updates (TFS Update 1 / numerous Windows updates) I am unable to add members under any group. This might be unrelated but I have not done any other modifications to the system.</p>
  
  <p><img src="https://i.stack.imgur.com/K92le.png" alt="Disabled &#39;Add member&#39; section"></p>
  
  <p>The whole add member section is disabled and I have no idea why. I have always used this functionality logged in with the same Windows administrator account.</p>
  
  <p>OS is Windows Server 2012.</p>