Help! Subpage listing problems

Ok, I have no idea what’s going on, this was working yesterday, today it isn’t. But basically I have a couple of pages that are listing their subpages. So I have subpage template, the wierd thing is it will work here: http://rpgland.com/specials/special-features/ exactly as it is supposed to. But in http://rpgland.com/wallpaper/ Nothing, it just doesn’t display anything. Any top level page with this will display nothing, same in http://rpgland.com/letters and http://rpgland.com/anime

Here is the code I’m using:

<ul>
<?php wp_list_pages('depth=1&title_li=&child_of='.$post->ID.''); ?>
</ul>

So what’s going on here?