I checked and the path is correct. Even if I just drop one level (../) it doesn't work. I also tried putting in the full address to see if that was the problem, but it didn't make any difference.
Everything is in lower case, so that's not the problem either. I'm hoping that it ends up being something that simple, but so far I haven't figured out yet what it could be. Thanks for your help.
If it might help, here's the php include code I used. I'm new to this, so maybe I did something wrong here?
<!-- begin news box -->
<?php
include("../sub/php/eventsbox.php");
?>
<!-- end news box -->
<br>
<!-- begin request box -->
<?php
include("requestbox.php");
?>
<!-- end request box -->