Jeff, The project is a 3 GB video of questions and answers for a 34 chapter biology course. The main menu is a seven button listing to link to chapters 1-5, 6-10, 11-15, etc. Those links then take you to a screen with five buttons to chose the specific chapter, and then when you chose the chapter link, it goes to another menu to chose an idividual question to play. Once a question is selected to play, it plays all the way through the end of the timeline unless the viewer stops it. Each submenu has a back button and a main menu button, as well. The first play is an 8 second video/audio clip of our logo that should then default to the Main Menu, but instead it jumps to the Q/A either of question 19, 20 or 21 in chapter 28.
I am pretty certain that every time I have previewed it, I have done so through the File Preview method. I haven’t used the Preview from Here on this project. I also have not tried any of the other suggestions you have, but I will do so and see what happens. It may take me a little while as I am not a video guy and am just slogging through this (with your excellent help) the best I can. I will repost when I have tried your suggestions and let you know what happens (unless you have any other ideas after reading the way the presentation is structured). Thank you for your ideas.