one reader doesn’t see transformed PHP

There is one reader of my blog who says he doesn’t get the pages that everyone else I know sees, but rather the original index.php file (the one that starts off
‘ <?php
/* Don’t remove these lines. */
$blog = 1;
require(‘wp-blog-header.php’);
// Uncomment the next line if you want to track blog updates from
weblogs.com’
My blog is at http://www.laurenwood.org/anyway; when I asked him to try http://www.laurenwood.org/anyway/index.php it worked fine. I’ve checked the DirectoryIndex and it has index.php in there (and nobody else has complained that this is happening, so usually it works). I pointed him at a few other WordPress blogs and he says they are all fine, just mine doesn’t work.
Has anyone else seen this? Any ideas on what might be going on? I’m running WordPress 1.0.2 on Debian 3.0 stable with Apache 1.3.26.