Hello Russ,
I decided to learn how to use endings for the same reason people do on paper. Makes it much easier to read and uses less real estate. I finally learned it is necessary to make the song length the sum of all the iterations. When played, the ending feature worked with the exception that on the second ending, it returns to the beginning but does not play those chord changes. It moves along as if it is playing the chords that are being displayed but in reality, it's not. I have not heard back from BIAB support yet. I hope they are working on the problem.
Joel