Had the same problem ... try this (I'm on an iMac, build4):

• Open BIAB
• Click ACW-Icon
• "File Chooser Window" opens - choose audio-file
• Analyze file in ACW - when you're ready, press "OK - Send to BIAB"
• ACW quits automatically (which I don't like, read below)
• In BIAB, press "Yes" in the "Answer Question" window (which automatically opened in the background)
• Now chords should appear in BIAB

I initially had the same problem - opened ACW, analyzed the file, pressed "OK - Send to BIAB" and - ACW quits w/o a message ! I thought it crashed - until I incidentally opened ACW from BIAB and I noticed the "Answer Question" - window. Can't remember that I read anything about opening BIAB first !

BTW, Peter, why does ACW quit after pressing "OK - Send to BIAB" ?? - I would like to check ACW's analysis further (eg. single notes) after having sent the chords to BIAB and refining the chord changes ....

Regards
RobKastler