Have you tried switching to the default theme to see if threaded comments work then? It could be that your theme doesn’t currently support comment threading – especially if it uses a custom comment listing.
Check what version of WordPress you are running, I’ts not supported out of the box with older versions. Also check if in your comments template they are being called properly. See If you have a line which reads
<?php if ($comments) : ?>
…etc.
<meta name="generator" content="WordPress 2.9.1" />
It’s supported on the site by WP. Whether the theme supports threaded comments is another matter entirely…
The theme needs to be specially coded to properly display threaded comments.
See default usage.
http://codex.wordpress.org/Template_Tags/wp_list_comments#Examples
So, I guess that my theme doesn’t currently support threaded comments. Kurosquare, I had a look at your link (thanks for that!), but I am quite new to this coding. Am I correct in assuming that I could change the code of my theme in order to have it displaying threaded comments? Sorry, but I can’t really figure out from the page you gave me how to do that…
Thanks for your help everybody!