[Plugin: Facebook Comments for WordPress] Incompatible w/ Fan Box?

Any idea why this plugin would cause a Facebook Fan Box to only show on single post pages, and not any others (blog index or pages)? Before installing this plugin, the Fan Box showed everywhere… I’m using the Fan Box code directly from FB in a standard widget, and the latest version of the plugin.

http://wordpress.org/extend/plugins/facebook-comments-for-wordpress/