masterbee

Problem solved

I removed the plugin installed Arconix FlexSlider and navigation will start showing.

I changed only slideshow: true in /inc/featured.php
This is my code:

<?php
// Query featured entries
$featured = new WP_Query(
	array(
		'no_found_rows'				=> false,
		'update_post_meta_cache'	=> false,
		'update_post_term_cache'	=> false,
		'ignore_sticky_posts'		=> 1,
		'posts_per_page'			=> ot_get_option('featured-posts-count'),
		'cat'						=> ot_get_option('featured-category')
	)
);
?>

<?php if ( is_home() && !is_paged() && ( ot_get_option('featured-posts-count') =='1') ): // No slider if 1 post is featured ?>

	<div class="featured">
		<?php while ( $featured->have_posts() ): $featured->the_post(); ?>
			<?php get_template_part('content-featured'); ?>
		<?php endwhile; ?>
	</div><!--/.featured-->

<?php elseif ( is_home() && !is_paged() && ( ot_get_option('featured-posts-count') !='0') ): // Show slider if posts are not 1 or 0 ?>

	<script type="text/javascript">
		// Check if first slider image is loaded, and load flexslider on document ready
		jQuery(document).ready(function(){
		 var firstImage = jQuery('#flexslider-featured').find('img').filter(':first'),
			checkforloaded = setInterval(function() {
				var image = firstImage.get(0);
				if (image.complete || image.readyState == 'complete' || image.readyState == 4) {
					clearInterval(checkforloaded);

					jQuery('#flexslider-featured').flexslider({
						animation: "slide",
						useCSS: false, // Fix iPad flickering issue
						slideshow: true,
						directionNav: true,
						controlNav: true,
						pauseOnHover: true,
						slideshowSpeed: 7000,
						animationSpeed: 400,
						smoothHeight: true,
						touch: false
					});

				}
			}, 20);
		});
	</script>

	<div class="featured flexslider" id="flexslider-featured">
		<ul class="slides">
			<?php while ( $featured->have_posts() ): $featured->the_post(); ?>
			<li>
				<?php get_template_part('content-featured'); ?>
			</li>
			<?php endwhile; ?>
		</ul>
	</div><!--/.featured-->

<?php endif; ?>

Theme Options > Blog > Featured Post Count > set 10
slider is OK, not shown navigation slider < > next last