I am also having issues hooking up the face book connect. The configruation is correct and I believe that there is a conflict with another plugin. When clicking on the face book icon on my website I get:
API Error Code: 191
API Error Description: The specified URL is not owned by the application
Error Message: redirect_uri is not owned by the application.
when I capture the error codes using the Error Console tool in firefox I get
www.facebook.com : server does not support RFC 5746, see CVE-2009-3555
Is there a list of CB plugins that conflict with the FBC?