I think there is a bug with invisible edits. In org 8.2.10 if I set this:
(setq org-catch-invisible-edits 'smart) ; or show and have org-toggle-pretty-entities active, then if there is no headline before point, with the point here: NH^{3} ^ I get outline-back-to-heading: Before first heading if I try to type anything. I also get this same error in org 9.0.7. It only happens with the 3 wrapped in {}. That seems like a bug to me. -- Professor John Kitchin Doherty Hall A207F Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803 @johnkitchin http://kitchingroup.cheme.cmu.edu