Rich, it sounds like you are using ASIO drivers for BiaB. ASIO is a one horse driver, meaning that it will only run one program at a time. If this is the case then you have a couple of options. One close BiaB then open the other program. Two use MME or WAS drivers in BiaB. I use MME drivers in BiaB so I can have BiaB and my DAW, which runs one ASIO drivers, open simultaneously.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

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