Registered Members can’t comment through login

No one else have this problem? I can’t find its source, so I’d really appreciate any help.

Here is my comments.php code, in case it has something to do with my theme:

<?php // Do not delete these lines
 if ('comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
  die ('Please do not load this page directly. Thanks!');

        if (!empty($post->post_password)) { // if there's a password
            if ($_COOKIE['wp-postpass_'.$cookiehash] != $post->post_password) {  // and it doesn't match the cookie
    ?>

    <p class="nocomments"><?php _e("This post is password protected. Enter the password to view comments."); ?><p>

    <?php
    return;
            }
        }

  /* This variable is for alternating comment background */
  $oddcomment = "graybox";
?>

<?php if ($comments) : ?>
 <a name="comments"></a><h2><?php comments_number('No Responses','One Response','% Responses' );?></h2>

 <ol class="commentlist">

 <?php foreach ($comments as $comment) : ?>

  <li class="<?=$oddcomment;?>">
   <a name="comment-<?php comment_ID() ?>"></a><cite><?php comment_author_link() ?></cite> Says:<br />
   <!--<small class="commentmetadata"><a href="#comment-<?php comment_ID() ?>" title="<?php comment_date('l, F jS, Y') ?> at <?php comment_time() ?>"><?php /* $entry_datetime = abs(strtotime($post->post_date)); $comment_datetime = abs(strtotime($comment->comment_date)); echo time_since($entry_datetime, $comment_datetime) */ ?></a> after publication. <?php edit_comment_link('e','',''); ?></small>-->
   <small class="commentmetadata"><a href="#comment-<?php comment_ID() ?>" title=""><?php comment_date('F jS, Y') ?> at <?php comment_time() ?></a> <?php edit_comment_link('e','',''); ?></small>

   <?php comment_text() ?>

  </li>

  <?php /* Changes every other comment to a different class */
   if("graybox" == $oddcomment) {$oddcomment="";}
   else { $oddcomment="graybox"; }
  ?>

 <?php endforeach; /* end for each comment */ ?>

 </ol>

 <?php else : // this is displayed if there are no comments so far ?>

  <?php if ('open' == $post-> comment_status) : ?>
  <!-- If comments are open, but there are no comments. -->

  <?php else : // comments are closed ?>
  <!-- If comments are closed. -->
  <p class="nocomments">Comments are closed.</p>

 <?php endif; ?>
<?php endif; ?>

<?php if ('open' == $post-> comment_status) : ?>

<a name="respond"></a><h2>Leave a Comment</h2>
<form action="<?php echo get_settings('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">

<p><label for="author"><small>Name</small></label><input type="text" name="author" id="author" class="styled" value="<?php echo $comment_author; ?>" size="22" tabindex="1" />
<input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />
<input type="hidden" name="redirect_to" value="<?php echo htmlspecialchars($_SERVER["REQUEST_URI"]); ?>" /></p>

<p><label for="email"><small>Mail (will not be published)</small></label>
<input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="22" tabindex="2" /></p>

<p><label for="url"><small>Website</small></label><input type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>" size="22" tabindex="3" />
</p>

<small>Your comment</small>
<p><textarea name="comment" id="comment" cols="100%" rows="10" tabindex="4"></textarea></p>
<p><input name="submit" type="submit" class="submit1" id="submit" tabindex="5" value="Submit Comment" /></p>
<p><small>You can use these tags: <?php echo allowed_tags(); ?></small></p>

<?php if ('none' != get_settings("comment_moderation")) { ?>
 <p><small><strong>Please note:</strong> Comment moderation is enabled and may delay your comment. There is no need to resubmit your comment.</small></p>
<?php } ?>

</form>

<?php // if you delete this the sky will fall on your head
endif; ?>

Thanks for responding,
Don’t have a plugin like that which I’m aware of 🙂

(Although I do have the WP_SMF plugin installed, if that is somehow affecting my comments.)

What was your cookie issue? Maybe mine is having a similar problem.

Looked at the code, but it didn’t seem to solve my problem, tried placing that line of code in a few places but didn’t seem to make a difference.

Thanks for the suggestion, anyway, though.

I apologize if I seem like I’m getting desperate here, but I would really like to have access to my comment profile.