I wonder if there could be a problem with that realtrack.

I loaded style _NOPROB.STY.
Left the key set to default C
Made the song 8 bars
Entered the chord progression Dm/// C/// Bb/// //// Dm/// C/// Bb/// ////

After multiple regenerations I get Dm Triad, Bb Triad but the C will often generate a Cm. Not once do I get a b7 in any of them.

Something is clearly off here.