I just tried to login into your site without being registered with Persona. All works fine, I can choose a password, and receive an email with confirmation link. When I click it I see an info box from Persona, but after only 3 seconds or so I get redirected to your site - so that is buggy. I see then a notice that your site couldn't log me in, which is fine, as I don't have an account. However, your site then starts to log me in over and over again. Which seems an issue on your site. Hope this info helps. I'm using chrome on OS X.
The subject line is in a good position, but it doesn't look like an input field si I overlooked it first... Similarly, the content area doesn't look like a text area - slightly confusing.