I am getting the same error:
sfc_update_user_details is not defined http://connect.facebook.net/en_US/all.js Line 54
<div class="fl" id="comment-form-container">
<h3 class="comment-counts-label">Leave a comment</h3>
<div class="fl" id="comment-form">
<div id="alt-login-methods"><p><fb:login-button onlogin="sfc_update_user_details();" scope="email,publish_stream" v="2"><a class="fb_button fb_button_medium"><span class="fb_button_text"><fb:intl>Connect with Facebook</fb:intl></span></a></fb:login-button></p></div> </div><!-- end of comment-form //-->
<div class="fix"></div>
</div>
Click Connect with Facebook, pops up window, login and allow, popup closes and page does nothing. Firefox console displays error above.
Last part of footer.php
<?php echo $theme_data['thg_google_analytics'];?>
<?php wp_footer();?>
</div>
</body>
</html>