After a user inserts his login details into the Remote Desktop Connection (RDC) window when trying to RDP to Windows 2012 RDS. The RDC window just gets greyed out and you can just see the RDS server name. Even after terminating the process he gets the same when trying to connect to any Windows 2012 and Windows 2008 RDS servers...... Strangely when he tries to RDP to a Windows 2003 Terminal server he is fine and can get in.
No other user has this problem!
Steps taken so far to possibly fix the issue;
Upgraded to RDP 8
Login as another user
New profile on desktop and on the RDS server
Replaced network port