My one and only app just started having issued with the Save (visual below). Clicking Save, I get a little flicker but it doesn't save. Publish, same issue. When I click Play, I get the below message. Removing the objects on the left navigation doesn't fix the issue, so I'm not sure if I can revert. I've tried a new browser. Continue Anyway, the app opens but to a navigation that precedes these changed.

Thoughts?