I'm running into an issue with VirtualDub that I haven't encountered until today. I was planning on doing some uncompressed test captures in VirtualDub but for some reason, DirectShow only displays a black screen. I can capture audio, but no video signal. If I switch over to VFW, I can view the video signal.

DirectShow
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VFW
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I'm also able to open the capture device successfully in VLC using DirectShow:
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Any suggestions? I deleted the VirtualDub registry entries, restoring it to the default settings but I'm seeing the same issue. This is a Windows 7 x64 system.