Ältere Blog Beiträge werden nicht angezeigt

<?php get_header(); ?>
<div class="narrowcolumn">
  <?php if (have_posts()) : ?>
  <?php while (have_posts()) : the_post(); ?>


  <div <?php if (function_exists('post_class') ){post_class();}else{ echo "class='post'";} ?> id="post-<?php the_ID(); ?>">
    <div class="box_content">
      <div class="box_content_b">
        <div class="title_b">
          <div class="title">
            <div class="title_t">
              <div class="pad_title">
                <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>">
                  <?php the_title(); ?>
                  </a></h2>
              </div>
            </div>
          </div>
        </div>
        <div class="entry">
          <?php the_content('Readmore...'); ?>
          <?php if ( function_exists('the_tags') ) { the_tags( '<span>Tags: ', ', ', '</span><br />'); } ?>
          Category :
        </div>
        <div class="container_metadata">
          
        </div>
      </div>
    </div>
  </div>
  
  <?php endwhile; ?>
  <br clear="all" />
  <div class="navigation">
    <div class="alignleft">
      <?php next_posts_link('&laquo; Previous Entries') ?>
    </div>
    <div class="alignright">
      <?php previous_posts_link('Next Entries &raquo;') ?>
    </div>
  </div>
  <?php else : ?>
  <h2 class="center">Not Found</h2>
  <p class="center">Sorry,but you are looking for something that isn't here.</p>
  <?php include (TEMPLATEPATH . "/searchform.php"); ?>
  <?php endif; ?>
  <div class="commentbox">
    <?php comments_template(); ?>
  </div>
</div>
<?php get_footer(); ?>

<?php
/*
Template Name: Artikel
*/
?>
<?php get_header(); ?>
<div class="narrowcolumn" > 
<?php query_posts('category_name=Blog'); ?>
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
    <div class="post" id="post-<?php the_ID(); ?>">
        <div class="box_content">
        <div class="box_content_b"> 
            <div class="title_b">
            <div class="title">
            <div class="title_t">
                <div class="pad_title_page">
                    <h2><?php the_title(); ?></h2>
                </div>
            </div>
            </div>
            </div>
        <div class="entry"> 
            <?php the_content('Readmore...'); ?>
            <?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
            <span class="editpost"><?php edit_post_link('Edit this entry.', '<span>', '</span>'); ?></span>
            <div class="clr"></div>
        </div>
        </div>
        </div>
        
    </div>
<?php endwhile; endif; ?>
</div>
<?php get_footer(); ?>