Suddenly for no reason I have lost the Shutdown Button in the Start menu. If I R-click the taskbar the Task Manager is greyed out and if I Ctr-Alt-Del the only options are Shutdown and Cancel, everything else eg Task Manager, change password, log-off and lock computer are all greyed out. This is a Terminal Server in a domain and using the Administrator's domain password. The main server using the same password is fine.
Where and how are these controlled both locally and in group policy?