This also happened to me several times lately, on different workstations.
The only thing I was able to track down at first, using the chrome web-developer tools (F12), was that some 3rd party javascript libraries were not loaded or responding. The culprits always seem to be google analytics, hellobar and js-stripe.
I just found the cause of this today and in my case it seems to be related to the Adblock Plus extension running on all my chrome installations.
The strange thing about this is that whitelisting cgcookie.com doesn’t help at all (had allready done that anyway).
What fixed the problem for me was to actually completely disable the extension, restart the browser, login to cgcookie (which works after disabling the extension), logout of cgcookie, enable the extension again and restart the browser once more. The login now works again as it used to.
Cheers
Martin
