The following is a post I made back in 2019 when I had the black screen issue -
"I am getting a black screen in debut video capture. My HP PC has two AMD graphics cards, an R7 and R5 series which show in device manager. If I disable either of these Debut seems to work normally again.
Is there a way around this, I never had to do this when I first bought and installed Debut. "
I never got an answer to this post. My current PC has intel graphics and don't have this issue anymore.