I have the official Facebook plugin v.1.3 on my website. The plugin is activated, the Facebook Like Box widget can be moved into the sidebar and all options set, yet it doesn't show up in my sidebar. All the other widgets work fine - no problem. Looking at the HTML source the sidebar container has divs for all of the other widgets - except the Facebook container. As though if the dynamic sidebar was not reading the widget.
It was working fine a few days ago, and all of a sudden the feed stopped but the container still displayed(empty). I uninstalled and re-installed the plugin and now the widget won't even display - even though it drags and drops just fine in admin, and you can set and save the settings. Has anyone else run into something like this with the Facebook plugin?