I have these same instability issue with BIAB 2021 on windows 10.
Crashes, Refuses to close, etc.
I also have an RME sound device.
It is rock solid with Cubase 11, MixBus32 7.0, and Native Instruments Maschine.

Using BIAB 2021 as a VST gives minimal problems.

These issues and the lock-in on a 44.1 sample rate are really turning me off to PGmusic.

This will be the last year I upgrade without the ability to test thoroughly first.

Regards


BIAB Audiophile 2025, Cubase 14, Ardour, NI MK3.
i7, 32GB, 5TB. RME, Focusrite
Yamaha, Novation, and Roland