adding category parameter to query_posts breaks theme

When ever I add a category parameter to query_posts the them breaks.

with no category parameter the code works fine.

<?php

			//The Query
			query_posts( array (  'posts_per_page' => 5 ) );

			while ( have_posts() ) : the_post(); 

			?>

            <div class="home-post">

            <h2><a href="<?php	  the_permalink() ?>"><?php the_title(); ?></a></h2>

            <div id="date"><?php the_time('F j, Y'); ?> </div>

            <div class="clear"></div>

            <div class="post-content"><?php	 the_content('Read More &raquo;'); ?></div>

            <div class="post-clear"></div>
			</div><!--/home-post-->

			<?php endwhile; wp_reset_postdata(); wp_reset_query(); ?>

as soon as I change the query to this:

//The Query
			query_posts( array ( 'category_name' => 'flash', 'posts_per_page' => 5 ) );

The template breaks and yields some strange elements on the output code that are breaking the theme. Below is what is output when a category parameter is added to query_posts
<u style="display:none"> <!--Web Page code is in here--></u>