Thanks Noel!

That is the process I am using. I changed the real track several times using your example and did not have the problem.

However, when applying the same process to the song I created myself, I still have the original problem. Some real tracks will play and some will only play on the first bar.

I am thinking that I must have done something wrong in setting the song up. I am going to try creating my song from scratch again and see if I have the same problem. If the problem goes away, I will compare all the settings between the two to see if I can spot the reason for the problem. I will post my results!

Thanks again for answering!