No Facebook Feed, only warning message visible?
If you are having trouble and you are not finding error messages on the Facebook Options page of our plugin about your access token not being valid then to double check it please go here. https://developers.facebook.com/tools/debug/accesstoken add your access token and you will see if you token is valid or not. Then, when posting for support, please let us know the error or success message so we can assist quicker.
If the token is NOT valid then go back to the Facebook Options page of our plugin and click the button to get a new token. After you get a new token make sure and also paste that access token in your shortcode too, if your shortcode currently has one. Finally make sure and empty the cache from the Settings > Global Options page of our plugin and see if the feed is visible again.