Update --> I think it is the Mega Trig for Random Fret and Hand noises and affects Several acoustic guitars.
I played my midi piece with the S90 Piano and strings removed from my preset to leave only the Spanish Guitar.
Halion still committed suicide so it looks like it is the Spanish Guitar.
Back to my original 3 program preset, but I retested my preset several times on each one replacing the Spanish Guitar program with a variety of other programs one by one - Bright Pop Piano, 4.0 Rock Organ, Accordian Duo, Africa Brass, Ancient Pluck, Artic Piano, Alien Style FX, Accent Strings, 90s Synth Comp, 3 Osc Lead, 4.0 Big PWM Strings, Aah Chior and Strings, 4.0 Sax Quartet.
Each time my song played fine so I repeated the test replacing the Spanish guitar with some electric ones … Blues Lead Guitar, Modern Strat, SR Liquid Guitar, Reggae Jam, R&B Accoustic, Pedal Steel Guitar, Funky Switch.
These also played fine.
So I tested some acoustic guitars instead … Folk Steel String, Easy Nylon Guitar, 12 String Acoustic all worked, but Spanish Guitar, Funky Steel Guitar, Real Steel Solo all FAILED.
I then noticed that each of the failed has random Fret and Hand noises, so I deleted the MegaTrig off these sections in the program - they now work.
Tetative Conclusion ---- The Mega Trig for Random Fret and Hand noises is causing Halion to raise a fatal exception (Commit suicide!) for several acoustic guitars. It will possibly affect other guitars.
I also note that I am not the only one seeing this problem