wp-comments-post.php returns blank

http://mosquito.wordpress.org/view.php?id=1181

please fill as many information as you can so the devs can try to reproduce

I am also having the exact same issue… http://www.arrogantly.com

upgraded to 1.5.1.2…. and still its not working… I have come across many users with such an error

I will post snippets of my comments.php where I think the errors might be

<form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">

<?php if ( $user_ID ) : ?>

Logged in as /wp-admin/profile.php"><?php echo $user_identity; ?>. /wp-login.php?action=logout" title="<?php _e('Log out of this account') ?>">Logout »

<?php else : ?>

<div class="commentforminfo">
Information for comment users
Line and paragraph breaks are implemented automatically. Your e-mail address is never displayed.
Get notified of replies to your comment by ticking the subscribe to comments checkbox.
</div>

<label for="author"><small>Name <?php if ($req) _e('(required)'); ?></small></label>
<input type="text" name="author" id="author" value="<?php echo $comment_author; ?>" size="22" tabindex="1" />

<label for="email"><small>Mail (required) <?php if ($req) _e('but not published'); ?></small></label>
<input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="22" tabindex="2" />

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

<?php endif; ?>


<div id="button">

<input name="submit" type="submit" tabindex="5" value="<?php _e('Post it!'); ?>" />
<span class="smaller">
<input type="checkbox" name="subscribe" id="subscribe" value="subscribe">
<label for="subscribe">Subscribe to comments </label>| <?php comments_rss_link(__('Comments RSS')); ?> |

<?php if ( pings_open() ) : ?>

" rel="trackback">

<?php _e('TrackBack URI'); ?>

<?php endif; ?>
</span>
</div>

<?php do_action('comment_form', $post->ID); ?>

</div>
</form>

1. Yes.

2. No

3. No

As I mentioned above, its got to do something with the lines I posted above.. I messed up somewhere there but its almost identical to the default theme php calls.

I have read that it could be a problem with some empty spaces but I dont know where to look for these empty spaces

single.php is not necessary.. I think its got to do with the lines I posted above.. somewhere I made a boo boo.. in such situations… only one thing to do… sit,cry and scream for podzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz