I came up with another trouble shooting idea. I have a project where the learner selects an avatar at the beginning of the course. I have several scenes to make the project easier to work with and test. I have learned to put a trigger in the first slide of a section so I can test it as some of the actions depend on the avatar being present.
I did learn as David mentions that this trigger needs to be in the beginning of the scene before the other triggers so it runs. I often run my test with several of the avatars just to be sure I have added them correctly to each scene. I do have to remember to delete that trigger once the scene is working.