The last couple people that have tried to create accounts on our site have said that the account creation isn't working. I've looked at the settings and nothing has been changed as far as I can tell. I've even created a new account myself (which worked fine), so I can't reproduce whatever they're going through.
When you have a minute could you check aftermathkt.dkpsystem.com and see if you can see anything? It's been happening for about a week now.
I suspect these are related somewhat, but your "Warcraft Logs" menu had an unclosed <iframe> tag, and as a result, the bottom part of your site wasn't rendering.
I've closed the iframe (adding </iframe> to the end) and now anything dependent on the subsequent scripts should be working again.