Drupal 7.9 Ajax Popup Error

We upgraded our modules. Now, our pop-up login gives us this error:

An AJAX HTTP error occurred.
HTTP Result Code: 404
Debugging information follows.
Path: /pop/ajax/login
StatusText: Not Found
ResponseText:
Page not found | TeachHUB
var $jq = jQuery.noConflict();

I checked out some threads and enabled Custom Content Panes and it still does not work. The Firebug error is this:
pop/ajax/login 404 Not Found

However, the link that the button goes to is pop/nojs/login.