I noticed even on facebooks developer page the <fb:registration> example is not loading as well. I just changed temporarily the creation of the registration plugin to the iframe version until there is an update.
https://developers.facebook.com/docs/plugins/registration/#named_fields
the way I fixed this was pretty simple.
inside visual-subtitle.php line 301 :
change this :
$title = $title . '<span class="subtitle">' . $subtitle . '</span>';
to this :
$title = $title . ' <span class="subtitle">' . $subtitle . '</span>';
the only difference is the space before the <span class=’subtitle’> tag.
