Uncle Twisty

Found a solution jslanglois:
you have to reset the query

<?php get_template_part( 'loop',  'page'  ); ?>
               <?php $temp_query = $wp_query; ?>
               <?php query_posts('cat=4&showposts=5'); ?>  

               <?php while (have_posts()) : the_post(); ?>
                 <div id="post-<?php the_ID(); ?>">
                    <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>

          			<div class="entry-summary">
             		  <?php the_excerpt(); ?>
               		</div>
            	 </div>
		 <?php endwhile; ?>
<?php wp_reset_query(); // reset the query ?>
    	</div>

it worked for me hopefully it will work for you.