Capturing sound but no video--could Flash be the culprit?

Hi, I've scoured the forums here but haven't turned up an answer. I'm trying to video capture a small .swf game. Sound captures fine, but no video. I've fiddled with a million settings combinations, but not dice.

I know, I know, Flash is archaic and silly, but I'm developing a game for mobile, and that's the format the dev tool compiles to on Windows. Afterburner looks like a great way to capture gameplay footage, but I'm stuck. Any ideas or advice are greatly appreciated, thanks.

 

Does flash use DirectX? Maybe that's why...?

 

I think you have to record in Desktop-Mode, so no active 3D processes have to be recognized: