I believe help is coming with the new round of fixes which is about to launch.

Release notes (build 810, Dec 16)

Fixed: Selecting a patch on the Thru track did not work.
Fixed: Master > Freeze All Tracks and Unfreeze All Tracks did not work.
Fixed: Switching MME devices had not effect until rebooting.
Fixed: Switching from MME audio drivers to WAS audio drivers, and then back to MME would result in no sound.
Fixed: Master track plugins were not saved in song files.
Fixed: Band-in-a-Box should attempt to load a plugin with jBridge if the architecture is correct (x64/x86) but simply not a VST plugin.
Fixed: Waves plugins were not loading.
Fixed: Slow redrawing when resizing Pianos on Mixer.
Fixed: Volume and Pan were not sent to the Default Synth for some tracks.
Fixed: Unnecessary 'Audio Plugin removed from track' notification.
Fixed: [F6] would crash program.
Fixed: File > Save Special > Save Song As MIDI File would crash program.

BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6