This is something that could discourage users to register : the "refresh" button of the captcha does not work. So, when you are not able to read it (as I was just before this message); you cannot display another captcha - thus you need to reload / refill the whole page...
looking for it, tx for reporting
From the current looks of things reload takes 30+ seconds, but it works. But then again in other regions it might time out before it reloads. So perhaps captcha has server problems, we'll keep an eye out and dig a little deeper if it doesn't improve over the next couple of days.