Microsoft have issued a fix for Windows Server 2012 (which includes WS2012e) and Windows 8 Release Preview where Multimedia or communication activities may cause the computer to stop responding.
The system may randomly stop responding (hang) when you work on multimedia or communication activities. This problem may occur during video editing, unified communications, or any other multimedia activities.
This problem occurs because of an issue in the interaction between the state-machine driving dynamic tick transitions and the state-machine-driving clock rate changes.
Microsoft have released an update via the optimal updates panel in Windows Update to fix this problem. More details are available from here.
Multimedia Activities may Cause a Computer that is Running WS2012e to Stop Responding is a post from: MS Windows Home Server - Your Personal Guide to Microsoft Windows Home Server!