There is a problem with Google Captcha that is making Account Creation impossible at this time.
It also affects anywhere the Google Captcha appears (that box with the random words you have to type).
So this means it will block anyone trying to log in after failing to get the password right a few times, or where someone else has been trying to guess your account password.
You will see an error message like "Could not open socket".
The issue has been occurring for at most the past 15 hours.
We are working on this issue and will report back when we know more!