Fatal error message after updating to wordpress 3.7

sometimes inactive plugins can cause problems too.. try renaming plugins folder completely to plugins.tmp or something and try..
also try flushing cache.

Thanks shadez, it worked. The problem was wp-content/cache folder. I renamed it and everything is OK now.

OK, site is down again with the same error message and I didn’t change anything in the meantime. What now?

how have you implemented search on your site? share your code so we can debug.

I looked in my theme’s search.php file, there’s no _search_terms_tidy function. Here is the code:

<?php get_header(); ?>

<div class="indextop">

<div class="randomgames">
<?php if (have_posts()) : ?>

<div class="randomtop2">

		<h2 class="pagetitle">Search Results</h2>

</div>

<div class="randomgame">

<?php while (have_posts()) : the_post(); ?>
<div class="gamethumb">

<div class="thumbs">
<a href="<?php the_permalink() ?>" title="Play <?php the_title_attribute(); ?>"><img src="<?php $values = get_post_custom_values("thumb"); echo $values[0]; ?>" alt="" height="135" width="180" /></a>
</div>
<div class="thumbtitle">
<a href="<?php the_permalink() ?>" rel="bookmark" title="Play <?php the_title_attribute(); ?>"><?php
$tit = the_title('','',FALSE);
echo substr($tit, 0, 30);
if (strlen($tit) > 30) echo " ...";
?></a>
</div>
</div>
<?php endwhile; ?>

</div>

<div class="randombottom"></div>
<?php if(function_exists('wp_pagenavi')) { wp_pagenavi('', '', '', '', 3, false);} ?>
	<?php else : ?>

		<h2 class="center">No posts found. Try a different search?</h2>

	<?php endif; ?>
</div>

</div>

<?php get_footer(); ?>

UPDATE: Site is working, but i have noticed something strange. When I test my site on GTMetrix, site can be seen from servers in USA and Canada, but not from London, Hong Kong etc. When I check with Google page speed ( developers.google.com/speed/pagespeed/insights/ ), site is not visible – showing previous fatal error message. Tried https://pageload.monitis.com/ and https://gtmetrix.com/reports/www.symbolgames.com/rHDF5ghZ with similar results. Also, number of visitors dropped. My webhosting company claims it has nothing to do with them.

Everything working great now. shadez, thanks for help.