I am using the theme Nebula. I edited the file /wp-content/themes/default/archive.php Here is a link to the problematic site if you need more info https://www.motormayhem.net click the june 2007 archives and you will see.
I made the line
<?php while (have_posts()) : the_post(); ?>
<div class="post">
<h3 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h3>
<small><?php the_time('l, F jS, Y') ?></small>
<div class="entry">
<?php the_content() ?>
</div>
<p class="postmetadata">Posted in <?php the_category(', ') ?> | <?php edit_post_link('Edit', '', ' | '); ?> <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?>
</div>
to
<?php while (have_posts()) : the_post(); ?>
<div class=”post”>
<h3 id=”post-<?php the_ID(); ?>”>” rel=”bookmark” title=”Permanent Link to <?php the_title(); ?>”><?php the_title(); ?></h3>
<small><?php the_time(‘l, F jS, Y’) ?></small>
<div class=”entry”>
<?php the_excerpt() ?>
</div>
<p class=”postmetadata”>Posted in <?php the_category(‘, ‘) ?> | <?php edit_post_link(‘Edit’, ”, ‘ | ‘); ?> <?php comments_popup_link(‘No Comments »’, ‘1 Comment »’, ‘% Comments »’); ?></p>
</div>