On Microsoft Windows Vista, when playing a High Definition WMV video file through Windows Media Player, and you switch your display to clone mode, the video playback may hang

Source: Microsoft Support

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On Microsoft Windows Vista, when playing a High Definition WMV video file through Windows Media Player, and you switch your display to clone mode from either single display or dual view mode, the video playback may hang.

Microsoft has acknowledged this to be a problem with Microsoft Windows Media Player.

The video playback will resume after a few minutes.  To avoid this, switch the display mode to clone before launching the video.

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