Unable to Register
There is a time where a user unable to register to the site using EasySocial registration page, it could be because of K2 User Plugin. It'll generate a captcha form whenever a user registered on the site with joomla registration. So, when a user register using EasySocial registration form, EasySocial system will tries to save the user object but then, k2 user plugin will reject the saving because of missing the captcha/recaptcha form.
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To fix this, navigate to
Components > K2 > Users > Parameters > Advanced and turn off Enable reCaptcha on registration form.