I have come to the sad conclusion that BIAB cannot play a mMaj7 chord (despite accepting the chord notation input).
This is with RealTracks.
I have done the Ctrl-F8 combination (over the bar) more than 20 times in an attempt to hear the chord played properly and not a single time was it played.
It loves to play Maj7 chords though.

Does anyone know the secret to getting these chords to sound in audio?