I am having a similar problem. I’ve created a project that has 3 menus and 3 timelines. The project is a continual loop. I have a menu that is set as first play that runs for 10 seconds and then goes to the first timeline, then its end action takes you to the 2nd menu, then the next timeline, etc. When I hit stop twice, remove it and then reinsert it, it seems to start playing again at random points.
Joe, if I understand your response, you’re saying you can set a timeline as first play, but in my case I want the first menu to be first play and it is set as first play. Any ideas?