https://secure.ally.com/
With EasyPrivacy enabled, clicking the log-in button makes it change to a loading animation for a moment, but then the loading animation goes away and you're left looking at the login form.
Disabling EasyPrivacy prevents this issue from occurring.
Interestingly, if I disable EasyPrivacy, then load the page and log in, then re-enable EasyPrivacy and log out, I can log in again until my cookies are cleared.