WP 3.1 breaks posts order via category__not_in ?

After migration from WP3.0.6 to WP3.1.3 my posts order is no longer work as before. My code is very simple just a little custom query on index.php in my template folder.

<?php
	$args = array(
		'orderby' => 'title', 'order' => 'ASC',
		'category__not_in' => array ('7')
	);

	$query = new WP_Query($args);
	if($query->have_posts()) :
	while ($query->have_posts()) : $query->the_post();
		the_title(); echo '<br>';
	endwhile;
	endif;
?>

Please suggest. Thanks in advance.