Hi Rick
One of the handier "detective" keys in RB is the F2 if you're using midi and looking for strange command changes (CCs). Especially in the first couple of bars.

If you haven't tried it already, click on each midi track in turn and click F2. All data is in blue, all commands are in what looks like brown. Make sure everything on each track has the same channel number, and that each Event
isn't set to a "0" which means the Event has been turned off.

As I said - it's a thought as has been already mentioned about some setting accidentally inserted in the first couple of bars - F2 will show you the initial settings on each track.
Have you already tried this?

Good Luck - Ian


Ian
My "Original Tunes" Site
My gene pool needs more chlorine.