URLs in comments stripped

Hello there, I’m using WordPress 1.5.2 and URLs in the comments (in the form of a href) get stripped for no apparent reason.

My kses.php file seems to be right:

// You can override this in your my-hacks.php file
if (!CUSTOM_TAGS) {
$allowedtags = array(
'a' => array(
'href' => array(),
'title' => array()
),
'abbr' => array('title' => array()),
'acronym' => array('title' => array()),
'b' => array(),
'blockquote' => array('cite' => array()),
// 'br' => array(),
'code' => array(),
// 'del' => array('datetime' => array()),
// 'dd' => array(),
// 'dl' => array(),
// 'dt' => array(),
'em' => array(),
'i' => array(),
// 'ins' => array('datetime' => array(), 'cite' => array()),
// 'li' => array(),
// 'ol' => array(),
// 'p' => array(),
// 'q' => array(),
'strike' => array(),
'strong' => array(),
// 'sub' => array(),
// 'sup' => array(),
// 'u' => array(),
// 'ul' => array(),
);

So the question is… what’s wrong here?

I’d appreciate your help — thanks.