agiesbrecht on "wp_tag_cloud displays correctly… except on the home page"

I've been using wp_tag_cloud on my footer, which is inserted via the get_footer on all pages. It works perfectly, except on the home page, where it doesn't show anything.

This is the code:

<div class="boxes grid_7 metaboxes">
<h5>Tags populares</h5>
<p><?php wp_tag_cloud('number=50&smallest=10&largest=10&orderby=count&order=DESC'); ?></p>
</div>

However, on the home page, and only there, the output is:

<div class="boxes grid_7 metaboxes">
<h5>Tags populares</h5>
<p></p>
</div>

Home page: http://www.jogosdosaopaulo.com.br/
Example of page where it works: http://www.jogosdosaopaulo.com.br/gol-espirita-braganca-paulista/

(The cloud is at the bottom of the page.)

Does anyone have an idea of what can be causing this?

Thanks in advance for any help,
Alexandre