I suspeced it was a flickering thing. Thanks for clarifying.The card or its software probably can't handle variable framerate. Because it's next to impossible to perfectly synchronize GBA and 3DS LCD output, the 3DS LCD's framerate has to be flickered by repeatedly adjusting how many lines it should draw, and this probably messes with your capture card.
I see. That's unfortunate.He is banned and as such cannot reply