The information below applies to Windows Media 9 series for Windows XP, 2000, ME, 98 SE. When a client tries to play back video content on a non-primary monitor, either no video is rendered and the client sees only a black frame, or only the first video frame is displayed. Audio plays back without error. Windows Media Player 9 Series enters a deadlock state when it starts playback on a non-primary monitor. The Player is waiting on certain information that follows the signaling of the display change event, but it never receives this information because of timing. This update (820772) brings your file wmp.dll to build 9.0.0.3003, dated 11-Apr-2003. Download 820772 fix from Microsoft server Tech-Critic have found another update that was not publicly available before. This one however is unsupported and therefore to be considered beta. Furthermore the update was meant for the WMP9 SDK originally. 819756 will update wmp.dll to build 9.0.0.3005: The Microsoft Windows Media Player ActiveX control object model provides the Settings.enableErrorDialogs property. The purpose of this property is to enable developers to suppress all Windows Media Player dialog boxes when using the ActiveX control in a custom application. However, in versions of the Player later than version 7.0, some dialog boxes are not suppressed when enableErrorDialogs is set to False. To maintain compatibility with existing applications, a new service type that hides all dialog boxes is being added to the control.