Well put Graham, and on second thoughts, I agree it does seem to be a programming issue, not any fault of Neil Swainson. Like you I have hundreds of standards, and it would be impractical to change all the bass lines with Celemony Melodyne.
I guess we can only hope that this will be resolved...or at least improved in future BB updates. In the meantime, I will unhappily use my SC88 midi bass. Despite the poor sound, at least the bass lines make some sense...

Mal