Facebook API settings not verifying

I've properly added the APP ID/KEY and Secret codes and confirmed the ap (in Facebook) has the proper site url and I'm still getting the red X with Please, enter correct Facebook API settings message...

I had the "facebook" plugin installed just prior and it was working fine...

Just reset the secret key and updated it and still no verification.. I'm at a loss of what to try next? is there some conflicts due to the prior facebook plugin?