single_cat_title return nothing

Strange things with me and WordPress today.

<?php single_cat_title(); ?> return nothing inside loop. Please, what wrong here?

Full Code:

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
		<div <?php post_class(); ?> id="post-<?php the_ID(); ?>">
			<h2><?php the_title(); ?></h2>
			<div class="entry">
<?php single_cat_title(); ?>
				<?php the_content('<p class="serif">' . __('Read the rest of this entry &raquo;', 'kubrick') . '</p>'); ?>

				<?php wp_link_pages(array('before' => '<p><strong>' . __('Pages:', 'kubrick') . '</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>
				<?php edit_post_link(__('Edit this entry', 'kubrick'),'','.'); ?>
			</div>
		</div>
	<?php comments_template(); ?>
	<?php endwhile; else: ?>
		<p><?php _e('Sorry, no posts matched your criteria.', 'kubrick'); ?></p>
<?php endif; ?>