Consider the following scenario:
In this scenario, the 3rd-party application that was being used for DVD playback may hang.
            - You have two or more displays connected to a Windows 7 PC and have chosen to "Extend these displays" in the Control Panel Display settings.
 - A 3rd-party DVD playback application is being used on the primary display to play a DVD.
 - While the DVD is playing on the primary display, Windows Media Center is launched and then moved to a display other than the primary display.
 
In this scenario, the 3rd-party application that was being used for DVD playback may hang.