The Likebox has changed recently. Again, for the n number of times, we have been faced with a situation as to know why does this does not work as before. It turned out that the Likebox widget was not showing the stream. So, I thought I would try to see why this is not working on two sites but on five others. As a coincidence, I tried to post something on the wall and it immediately was shown in the Likebox widget stream. This change is due to the fact that Facebook no longer shows the stream as is but only the recent ones. So, if you haven't posted something in the Fan page wall for a while (from an admin account), you might end up in the situation that your Likebox widget stream will be empty in the Web site where it is embeded.
I thought I would share this one as it took me about an hour to figure it out.