And on the login page?
I just downloaded the package from Web PI and, when I enter the appid and secret, I get the FB button...
Could you do a quick test?
Please edit the file with a text editor (like notepad) located ...nearforums-root...\Views\Authentication\ProviderSelect.cshtml
Add the following line at the top of the file:
<h1>Values: "@Config.AuthenticationProviders.Facebook.ApiKey" "@Config.AuthenticationProviders.Facebook.SecretKey"</h1>
And then browse to your login page: http://yourhost/login/
What to do see?