Hi, 
Thank you for the reply. I had to solvve the problem temporary by making a “child” file of the “Content-leftbar.php” by adding the following code in the end. 
“<div id=”secondary” class=”no-margin-left”>
  <?php get_sidebar( ‘left’ ); ?>
  <?php the_post_thumbnail(‘normal_thumbnail’); ?>
</div>”
This should not be needed and is not a good solutioin since I needed to redifine everything in the functioin.php
Do you have any suggestions on a better solution? I can still not get images in my post site this only solves it for my pages.
see: http://www.wordpress.m2d.se/news/ 
Thank you!
If you need more information pleas let me know and I will try to provied it 🙂