RealPresence Windows "failed to find microphone"

I am running RealPresence for Windows in Windows 10 Pro on a Lenovo with 8 GB of memory. The software had been working properly for a year but now I am getting intermittent drops in my *outbound* audio. The error log say:

2021-09-21 08:29:54,922 -0400 [INFO ][MPC] - [tid = 34772] Failed to find mic boost which may not exist
2021-09-21 08:29:54,922 -0400 [INFO ][MPC] - [tid = 34772] CAudioVolumeControl::CAudioVolumeControl, exit ==>

I get this whether I use:

- the microphone build into my laptop

- the microphone in my USB connected Logitech camera

I've never been able to get RP Windows to detect a Bluetooth microphone and speaker.

Thanks.