If you mean this thread: https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=800439#Post800439
I just reread it. I didn't see anything directly related to mMaj7 chords.

In the early days of RealTracks (and yes, I go back 30+ years also, way before them), I tried mMaj7 chords and in some tracks, the piano simply laid out for any measure that had one. I reported the particular style to PG Music and they discovered an indexing problem and issued a patch that fixed it. It might be that simple. This was critical for my work since mMaj7 chords occur a lot in Brazilian jazz. I had not encountered a problem since 2009.

It is certainly likely that not every RealTrack artist may have recorded every kind of complex chord that exists, but the program apparently has algorithms to construct something in those cases. None of us users have any idea how.

You have cited a bunch of RealTracks and Styles, and you've said it appears to be inconsistent since sometimes it works. So, my suggestion is to get specific. Post a link to a song on Dropbox that demonstrates this problem every time. Let us test it. If it also fails for us, we can pass it with a nudge to the developers.

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