kann es daran liegen??
<div id="slide-warp">
<?php
$featucat = get_option('themnific_slider1_category');
$my_query = new WP_Query('showposts=5&category_name='. $featucat .'');
if ($my_query->have_posts()) :
?>
<div class="flexslider">
<ul class="slides">
<?php while ($my_query->have_posts()) : $my_query->the_post();$do_not_duplicate = $post->ID; ?>
<li>
<a href="<?php the_permalink(); ?>">
<?php $image = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'folio-image'); ?>
<img class="bags" src="<?php echo get_template_directory_uri(); ?>/js/timthumb.php?src=<?php echo $image[0]; ?>&w=700&h=350" alt="<?php the_title(); ?>"/></a>
<h2 class="flex-caption"><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
</li>
<?php endwhile; ?>
</ul>
</div>
<?php endif; ?></div>