Email Subscription Form Not Working

I have the email subscription form and it was working fine, but now it only seems to be working when I am logged into the site. So visitors can not seem to subscribe.

You can see an example here:

Actually I just did some more testing and it is subscribing folks, but it doesn’t look like it is on the front end. Perhaps something to do with a cache? It looks like when you click the “Create Subscription” button that nothing is happening.

I tried disabling the cache (super-cache in this case). Still not working. Any thoughts?