Comments Plus: FB wont connect

I have several social plugins, amongst them, Comments Plus is one of them. The other plugs are able to open up and connect to FB without a problem.

With Comments Plus, was able to connect to Twitter, Google+, and WP. But the FB log in is not working at all. I have run and spent a good couple of hours trying to work with all of the combinations of options in the Comments Plus configuration page. Need help.