We've created several sites using the same theme (Genesis parent theme by StudioPress; Magazine Child Theme), etc. and one of which is not displaying the Facebook Like Box in our Primary Sidebar.
We're using Version 1.158 of the 'Add Link To Facebook' plugin on both examples.
Here's an example of a working installation:
Here's an example of the site where the Like Box is not displaying:
Any ideas or suggestions are greatly appreciated!
-Brian & WR