SEO caused PHP category LOOP Query to stop working i.e. $query_string . '&cat=*

I integrated wordpress into my website by using pho framework to list all articles within a set category

<?php query_posts($query_string . '&cat=3'); ?>

the whole code was

<?php query_posts($query_string . '&cat=3'); ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

 <div class="post">

 <!-- Display the Title as a link to the Post's permalink. -->
 <h4><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h4>

 <!-- Display the date (November 16th, 2009 format) and a link to other posts by this posts author. -->
 <small>Posted <?php the_time('F jS, Y') ?> by <?php the_author_posts_link() ?></small>

  <div class="entry">
    <?php the_content(); ?>
  </div>
	 <hr></hr>
<p></p>
 </div> <!-- closes the first div box -->

 <?php endwhile; else: ?>
 <p>Sorry, no posts matched your criteria.</p>
 <?php endif; ?>

this no longer works, I have tried replace the number with the catagory name used by the SEO but that does not work either.

Please help

THanks

Damien

https://www.ads-software.com/extend/plugins/wordpress-seo/