I figured this would be the best place to report bugs; please let me know if there's a better place/way.
Uncaught TypeError: Cannot call method 'initIfShown' of undefined stub.js:1
This results in the answer box rendering without any buttons, without autosaves, and without the preview of the question or answer as I'm writing it. Here's a screenshot:
I get no js errors in Firefox; I have not tested in any other browsers.