I got it to capture
Grab SCC_TOOLS.zip and read the docs, it's excellent. I can't get the CC to display however.
The graph is like this:
Hauppage WinTV PVR PCI II TvTuner->Hauppage WinTV PVR PCI II Crossbar->Hauppage WinTV PVR PCI II Capture,vbi->CC Decoder->Line 21 Decoder 2->Video Mixing Renderer 9
Hauppage WinTV PVR PCI II Capture,capture->Hauppage WinTV Color Format Converter 2->Video Mixing Renderer 9
Something like this works with another card, there seems to be a problem around the line21 decoder part. Maybe the driver puts out a corrupted format?