Yep, I’m definitely using the default 404 page. Is there anything you can recommend I do?
I’ve checked out wp-content/cache/supercache, and it’s creating the directory “404page”, but there’s nothing in it.
The reason I concluded that it must be super-cache is because after clearing the cache, the initial dead page returns a 404 header, and then subsequent views return 200 Ok. As stated previously, “half on” or “off” fix this.
My 404.php:
<?php get_header(); ?>
<div id="content" class="narrowcolumn">
<h2 class="center">Error 404 - Not Found</h2>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>
