OK - with your audio testing, it looks like its the audio that is causing the media player to lock up, not the graphics card or the graphics card driver. The DisplayLink graphics and rendering continues to work correctly.
The audio is external to the DisplayLink technology (I think it is provided by CMedia on this product), so I can't really help debug this.
One thing that it could be is if the device can't get enough power from the USB bus. The audio USB endpoint might not be stable, as it doesn't get enough power and drops out, confusing the player.
Is the adapter connected to an externally powered USB port, or connected directly to the PC? Its a long shot but worth checking.
Wim
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