"Can't Load URL" Error for Permissions and Tokens

Team WPMU,

At the risk of sounding like an idiot -- does anyone know why my Permissions and Tokens isn't connecting?

I have the site URL entered into the App Domain and Platform fields (as website). The Facebook API was accepted in the plugin, but the Permissions and Tokens section just spins and spins and spins. I've tried to "reset auth tokens" and it gives me an error that says:

"Can't Load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings."

But, the URL is in the FB App as instructed.

What am I missing? Any ideas?