Just installed on production site. No other plugins were installed and using TwentyEleven theme. I get the SFC settings menu item. I enter FB appliation ID and secret and save and nothing happens. All info is erased from fields. Also, there are no SFC "sub-modules" or sub-plugins listed under the SFC Plugins area, but I'm not sure if that is supposed to be like that? Perhaps it is like child themes and I'm supposed to install child plugins for SFC?