I don't understand what is up with your site - this and the old LeanStack - but when I have Ghostery enabled I'm completely unable to click buttons. Mind taking a look at it maybe?
I also have this problem and I don't even use Ghostery. Just plain vanilla Firefox 32.0.3 on Windows 7 with Cookie Monster and AdBlock Plus.
Went so far as to allow cookies because that fouls up a lot of sites and this looks really interesting, but still no dice. I'll see if updating to 33.0.2 helps.
EDIT: Nope. Clicking any button still has no effect.
OK, guys, if you are watching me using your site then could you PLEASE announce that in a very big red block on the landing page or in a way that cookies are announced on many sites nowadays?
You should accept that usage monitoring is an inacceptable privacy invasion for many people nowadays and we would like to be informed about that kind of monitoring before using a site, so we can decide if we like it or not.