Not the same problem here, but similar. Mine is that when putting in a 2 beat measure, then going back to a 4 beat, the RT bass won't follow a chord change until a couple of beats later if the 2 beat bar is held. So if I have a D chord in the 2 beat bar, and an F in the following 4 beat, the bass plays the D for a couple of beats into the 4 beat bar. Don't know if it does this with all RT bass settings, but most so far. Easy to work around but annoying.
Good luck.