Thanks Milky. I'm afraid this wasn't quite as easy. Besides forcing a reboot, I also tried to switch CPUs, using the sound card in a different computer.
None of this worked. Back in the original CPU, it's as if BaOne and the existing soundcard (which have been running together for >9 months) can't talk to each other.
And it may not be the card, either… because I have my backup audio processor (OmniaSST) back on the air, and it has no issue with the soundcard.
I may have to go back to the BaOne config, maybe something got corrupted?