Basic Redirection not working.

Hi Author,
sorry to rate this plugin down.
But I faced some serious issues while evaluating this plugin as:

1. When User Click Login Link over Review Box, it opens the facebook Login Pop-up.
2. On filling and login Facebook in that Pop-up, user is not automatically redirected to its current page as Logged In user.
Instead even after Login process done by facebook, Pop-up window is still appearing with its address url as:
http://mysite.com/not_found?action=wordpress_social_authenticate&provider=Facebook&redirect_to_provider=true

I already browsed support queries, but didn’t found anything useful.

this plugin looked promising before its actual testing like this.

It would be really Helpful if you please provide your inputs on it.

Update:
I Tried this plugin again, and found that, when user is not already logged into facebook or google, this plugin gives a pop-up to allow login and it works perfectly fine.
BUT, when user is already Logged In on facebook or google on another tab, then this plugin gives a pop-up window with connecting to facebook loading icon and it takes too much time to validate already logged in user and ultimately loading stops and pop-up window stays there with address bar URL as: http://mysite.com/wp-login.php?action=wordpress_social_authenticate&provider=Facebook&redirect_to_provider=true#_=_