Facebook Like Box

I am developing a site for a client that wants FB integration. They already have a FB page with a url of http://www.facebook.com/pages/XXX-XXX-Productions/XXXXXXXXXXX.
When I go through the steps to create a FB Like Box it ask for the page url. If I put in the above url, it does not display a box next to the input form. The first time I did this it did display a box and after finishing the steps it generated these two codes;

<script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like-box href="http://www.facebook.com/pages/XXX-XXX-Productions/XXXXXXXXXXX" width="274" colorscheme="light" show_faces="true" stream="false" header="true" style="border:none; overflow:hidden;"></fb:like-box>
<iframe src="http://www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2Fpages%2FXXX-XXX-Productions%2FXXXXXXXXXXX&amp;width=274&amp;colorscheme=light&amp;show_faces=true&amp;stream=false&amp;header=true&amp;height=62" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:274px; height:62px;" allowTransparency="true"></iframe>

The code worked for a week while the site was in maintenance mode but now has gone live and the Like Box disappears.

I am inserting the code in a WordPress theme sidebar by using

<?php include (TEMPLATEPATH . '/facebook.php'); ?>

I have tried both of the above codes, the xfbml was the one working.

Is there something that needs to be changed or has the client created their page incorrectly? Or is there another url for this page that I haven’t found?

Are you sure your include is getting activated?

Never thought of that. I entered the code directly into the sidebar and it worked. I then re-entered the include and it works also.
Don’t know why the include stopped working when the site went live.

Thanks for the suggestion.