Andrew Nevins on "[Theme: Storefront] Search form doesn't work on cart page?"

I've disabled ALL plugins (except for WooCommerce) and still exhibit the issue, which, if it works for everyone else, would indicate that it's some setting?

I've also now gone through changing lots of various settings (while all plugins were disabled) - still nothing.

In Web Inspector, I can some object quickly being inserted/removed at the end of the DOM (right before </body>). I can't make out what it is though.

I've also now tested the problem in Chrome (51.0.2704.103) and it, too, cannot submit the search form when on /cart/.