Slide Layers Panel has disappeared in Storyline view

Hi Stephen - if none of the solutions in this thread are helping and you are running out of time, perhaps you can put in a support ticket - https://articulate.com/support/contact/case. They usually respond really quickly.

If you don't have time to sort this out that way, here is another idea - what if you opened a new Storyline file (be sure to set the same story size) and imported all of the slides from the problem Storyline file into that new Storyline file? I bet the fresh file would show your layers.  Here's a link to instructions for how to import sides from other Storyline projects: https://community.articulate.com/articles/articulate-storyline-360-user-guide-how-to-import-slides-from-other-storyline-projects 

Hope one of these ideas works for you.