Just curious... does bandstand crash when you launch it by itself, without BIAB running? I've been experiencing some crashing too, but it seems to have stabilized a bit. Also, check your MIDI settings in BIAB. Make sure you have BIAB on CORE audio, then all of your ports to BIAB virtual output.
At this point I'm still using Bandstand for bass sounds. Real tracks take so long to load that it speeds things up to just get the bass from bandstand via midi. Sound is decent.
Good luck!