White line in middle of capture

I have a MSI G4Ti4200-VTD64 (MS-8870).
I have the drivers installed and the capture drivers installed. I am using WinProducer that came with my video card. I am running Windows XP.
A friend of mine has been trying to capture some footage off his camera. Everytime we try it (using composite or svideo in) there is a huge white chunk in the middle of the screen, you can hardly see any of the video. It stretches from the left side to the right and you can only see video just above and below it. It's almost like a widescreen video with white in the widescreen area and the video running above and below it.
So we put the tape in my camera and it does the same thing. Any other tape we use does not have this effect, it captures fine.
So we think it might be the tape. HOWEVER, when we watch the capture taking place in the preview window there is no white section, it is only when it is saved off to the file. Does anyone have any idea what might be causing this? And why it only happens once it is written to a file. It does appear to be just the one tape thankfully but it should not have the white section in it if it is not showing in the preview!

I don't really know why it's capturing that way but what you see on the preview may be sampled by a separate circuit for instant playback prior to when the actual capture write takes place and that could be being done by a different circuit so yes it can do something different than what you see...just depends on the circuit setup...
Cheers!! 8)

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