So far, the only way I know how to do what you're asking is this: -Video Recording tab > Do Not Record Microphone -Settings > Audio Settings > Set your audio balance to 100 for the microphone and 0 for system sounds. -When recording, use F9 to record video with system sounds and F10 to record only y...

I believe the problem is that when the game is set to Fullscreen, it's actually Borderless Window. The black screen happens when broadcasting through Steam's service as well, so it's not just Action! that's having problems.