widgets stoped loading data

I recently upgraded to 2.6.1 and since then my archive, recent posts, tags, and recent comments widgets stopped working.

I changed nothing on the site but upgrading the wp install.

Just for example here is my tags script.

<?php if ( function_exists('wp_tag_cloud') ) : ?>
<li>
<h2>Popular Tags</h2>
<ul>
<?php wp_tag_cloud('smallest=8&largest=22&number=30'); ?>
</ul>
</li>
<?php endif; ?>