I am using wordpress 3.8 and it appears it doesn't work, but if I look up at the source code it is there:
<a class="btn btn-no" href="/theroom/?cookillian_resp=0" rel="nofollow"><i class=""></i>No! Only store this answer, but nothing else</a></div></div>
So I guess it is a small problem with css styling or something, as I noted this I checked out with firebug and deleted the "display: none;" directive and it appears correctly.
Do you hav some idea of what we can do to make it work?
PS: As I checked out in your website, Javier, it happens exactly the same: check it out with the firebug, I saw that you translated it into spanish.