It sounds like you are using ASIO drivers. Most all ASIO drivers can only do one program at a time so if your DAW is on ASIO then nothing else will sound. Temporary change either your DAW or your video program to MME, WDM, or WAS drivers. I would change the DAW to WAS, listen then close the video and put the DAW back in ASIO.

I hope this helps.

PS - I run BiaB in MME and my DAW in ASIO as this way both can be active at the same time.

You know you're getting old when a recliner and a heating pad is your idea of a hot date!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware