What a coincidence, I'm having problems with my Neobitz and my ATI TV Wonder Pro capture card. I played my supergun today for the first time in months, and was met with a screwy image. Back when I used this same supergun on my old computer (with a Hauppague capture card), the video was fine, but on this ATI card, I get a lot of interferance in the picture, like this weird black snow, and lots of waviness.
Either ATI capture cards are picky about the not-quite-60-hz signal, or <gulp> my supergun got messed up a bit while it was just sitting there. I'm gonna hook it up to the old PC with the Hauppague card and report the results.