Last modified: 2014-02-12 23:53:32 UTC
This kinda breaks if you're testing on your local installation and / is a generic Apache "It works!" page.
It seems to actually be submitting the form straight to /?mobileaction=opt_in_cookie -- so not only does it go to the wrong place, it never sets the cookie in the first place.
Okay, this is now fixed in r101658.