I have B&P on one of the magazine's Cover disks, and I can tell you that did not run very well on 68000. Every time I try to play something, the system would freeze.
While I suspect that it was the 68000 that was giving you problems, I should point out that early on when trying to learn how to use B&P, I experienced a lot of freezes when trying to play a song.
After a while I realised that I had stupidly left the toggle switch on my MIDI interface set to SERIAL passthrough, rather than diverting the signal to the MIDI outputs.
So maybe the freezing is because you've got some tracks set to output to a MIDI interface, but either you have your MIDI interface still set to SERIAL passthrough, or not plugged in? Maybe?