I've just figured it out, but no idea why! I didn't have my DXi/VSTi Synth activated under MIDI/Audio Drivers setup. I selected Coyote as my DXi/VSTi and all is working fine again. Now ironically, WAP no longer generates an error message in BIAB too. All very bizarre. Maybe that was rebooting the whole PC.


Windows 10 Home 20H2 Build 19042.487
BIAB 2021 (Build 818)
Intel(R) Core(TM), i3-4160, CPU @3.60 GHz RAM 16 GB, 64 Bit X64-based processor
Zoom UAC-2 (USB 3 interface-built in midi)
VoiceLive 3 Extreme, Sputnik Valve Condenser Mic