MMR will try to use the hardware overlay to play back video for better performance. However, when working with multiple displays the hardware overlay will only exist on one of the displays: either the primary display or the display where WMP was started. If WMP is dragged to another display the video is shown as a black rectangle. Use this option to force MMR to use a software overlay which will work on all displays.
|Registry Path||Software\Policies\VMware, Inc.\VMware VDM\Agent\Configuration|