this screen seems to be broken:
Manage subscriptions You can follow the discussion on (name of the post here) without having to leave a comment. Cool, huh? Just enter your email address in the form here below and you’re all set. Email (you enter your email here) Send
It's for subscribing to a post without commenting. I had to remove the newline character (which was converted to
and destroying the <input> tag - probably by wpautop) on line 82 in templates/subscribe.php
Other templates seem to have this kind of bug too.