Thank you to all that replied, the good news is that without doing anything (!) I managed to get test chord sequences to play in Ableton and route the audio output to a new track for recording. It did crash after playing with the BPM in the host but at least now I should be able to get basic stuff into Ableton and then add additional MIDI and Audio tracks as usual. No idea why it just worked as no settings were altered !

Still having fun, should have purchased BIAB years ago ! I`ll explore the Ableton issues further and will report any fixes/hints to fellow users.

Chris