I think it can't deal with the traffic it's getting. I saw a couple of hits to my server and the page's progress bar moved a little, but it's been stalled for quite a while now.
Are you referring to the scan from our homepage or the Rails checker? Either way, could you get in touch with us at support@tinfoilsecurity.com or http://www.tinfoilsecurity.com/chat ? I'd love to see what went wrong.
We shouldn't be having issues with load.