noCaptcha ReCaptcha - 

Google has introduced a new recaptcha : http://googleonlinesecurity.blogspot.com.es/2014/12/are-you-robot-introducing-no-captcha.html

YOU NEED TO GENERATE NEW RECAPTCHA KEYS AT https://www.google.com/recaptcha/admin

WARNING: Recaptcha will stop working until you generate new keys compatible with API v2