No search result. Help plz.

Hi,
Since upgraging to 3.5.1 my search function stopped working. It returns “no result” for everthying. Plz help me sort this out.

searchform.php

<form method="get" id="searchform" action="<?php bloginfo('url'); ?>/"  >
    	<input name="s" id="s" type="text" class="sid-search" value="Sök..." onfocus="if (this.value == 'Sök...') {this.value = '';}" onblur="if (this.value == '') {this.value = 'Sök...';}" />
    </form>

Search.php

<?php get_header(); ?>
<?php get_sidebar('left'); ?>

    <div id="main-content">

		<?php if (have_posts()) : ?>

		<h4 class="pagetitle">sökresultat</h4>

		<div class="paged">
            <br style="clear:both"  />
		</div>

				<?php while (have_posts()) : the_post(); ?>

      <div class="entry" id="post-<?php the_ID(); ?>">      

				 <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent länk till <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
                <small>Inlägg av <?php the_author() ?> <?php the_time('j F'); ?> klockan <?php the_time('G:i'); ?> i </small> <h3><?php the_category(' ') ?> </h3> <small><?php edit_post_link('Redigera', ' - ', ''); ?> </small> 

				<div class="post">
<?php the_post_thumbnail(array( 600,250 ), array( 'class' => 'alignleft' )); ?>
				</div>

				<div class="meta"><span class="meta-left"><?php the_tags(); ?></span> <span class="meta-right"><?php comments_popup_link('Kommentera »', '1 Kommentar »', '% Kommentarer »'); ?></span><br style="clear:both" /></div>

</div>
		<?php endwhile; ?>

		    <?php wp_pagenavi(); ?>      </div>
	<?php else : ?>
          <div class="entry">
        <div id="search-icon-frame"></div>

		<h1>Sökresultat - Kunde inte hittas</h1>
        <div class="post">
		<p class="center">Beklagar, det du söker kunde inte hittas. Försök med en ny sökfras.</p>
        </div></div></div>
	<?php endif; ?>

<?php get_sidebar(); ?>
<br style="clear:both" /></div>
<?php get_footer(); ?>

Site: onyanserat.se

thx a lot. Christian