I had the same problem. If the Facebook page is set to display something other than the Wall you need to set the force_wall parameter to true. I have modified the Facebook Social Plugin Widgets to allow this option. This may be worth implementing in a future version. Below is the code I’ve added to includes/class-fb-like.php:
Thank you!!! I’ve been driving myself crazy trying to figure this out. This plugin at least allows for easy customization. I moded the code as you mentioned and now all’s well. Just needed to add some custom CSS div for the widget, which looks bad on a dark background.