Hi,
I am using 2016...updated my profile.
I just noticed that the only 3 scenes that are exporting are ones that i renamed from their generic Scene 1, Scene 2, Scene 3, etc. The rest are still named as Scene #'s, but also, I noticed they are in brackets??? (Scene 4), (scene 5), etc....
Which I just dug into further, and now see that means the "include in animation box" is unchecked somehow, obviously by accident.
FIXED! Thanks so much!