I’m trying to troubleshoot this as well — it appears specifically related to the “register/sign-up” portion and is throwing the JS error. I don’t know JS very well, but I’m trying to find a fix…My end solution for my site is to eliminate the sign-up code and replace it with a link to the registration page…
in my html/mod_login/default.php, I went to line 68/69:
<li>
<a href="<?php echo JRoute::_("index.php?option=com_user&task=register");?>" onclick="return hs.htmlExpand(this, {contentId: 'id_highslide_signup_1',outlineType:'rounded-white',width:330,height:360,outlineWhileAnimating:true} )" >
and I removed what is between the LI and the /LI and replaced it with a direct link to my registration page.
In my case this resulted in:
<li>
<a href="<?php echo JRoute::_("index.php?option=com_user&task=register");?>">
<?php echo JText::_('REGISTER');?>
</a>
</li>
Not sure if that’s an option for you, but until the developer fixes the javascript, I don’t have an option. 🙂
Hope this helps.