As a test, I copied all the chords to a new song and added the same BMason solo.

It plays fine now.

It seems to be not the Style, not the solo track and not PC power.
It seems to be the process ... trying different solos one after the other.

No one else runs into this?

And why is a guitar solor called "MIDI Fiddle?"

PS: Why is there an underline under word "now?"
I didn't put it there.