Just that I get this message in IE8. (see the captures). I already applied this patch (but problem is still there): http://drupal.org/node/1914084
"An error occurred while attempting to process /modal_forms/ajax/login:"
The markup for the link:
<a href="http://mySite.com/modal_forms/nojs/login" class="ctools-use-modal ctools-modal-modal-popup-small bt-1 ctools-use-modal-processed">Login</a>