Pagination funktioniert nur bedingt

<?php get_header(); ?>
<?php 
/*
*Template Name: Index Page
*/


global $woo_options; 
if (is_paged()) $is_paged = true; else $is_paged = '';
$counter = 0; $postcount = 0;
?>


        <div id="main">


            <div><?php echo do_shortcode( '[advps-slideshow optset="3"]' ); ?></div>
<br>


            <?php 
if ( get_query_var('paged') ) { $paged = get_query_var('paged'); }
elseif ( get_query_var('page') ) { $paged = get_query_var('page'); }
else { $paged = 1; }


query_posts('category_name=Kategorien&posts_per_page=10&paged=' . $paged); 
?>


            <?php if (have_posts()) : $count = 0; ?>
            <?php while (have_posts()) : the_post(); $postcount++;?>


            <?php $counter++; ?>
                    
            <div class="block<?php if ( !$is_paged && $woo_options['woo_home_one_col'] == "false" ) echo ' two-col'; ?><?php if ($counter == 2) { echo ' last'; $counter=0; } ?>">
                <div class="box post">
                                
                    <div class="date-comments">
                        <p class="fl"><?php the_time( get_option( 'date_format' ) ); ?></p>
                    <p class="fr"><span class="comments"></span><?php comments_popup_link(__('0 Kommentare', 'woothemes'), __('1 Kommentar', 'woothemes'), __('% Kommentare', 'woothemes')); ?></p>
                    </div>
                    
                    <h4 class="title"><a title="<?php _e('Link zu', 'woothemes'); ?> <?php the_title(); ?>" href="<?php the_permalink() ?>" rel="bookmark"><?php if (strlen($post->post_title) > 30) {
echo substr(the_title($before = '', $after = '', FALSE), 0, 30) . '...'; } else {
the_title();
} ?></a></h4>            
    
                    <?php if ( $woo_options['woo_content_normal'] != "content" AND !( $woo_options['woo_home_one_col'] == "true" AND woo_embed('') ) ) woo_image('width='.$woo_options['woo_thumb_image_width'].'&height='.$woo_options['woo_thumb_image_height'].'&class=post-thumbnail'); ?>
            
                    <?php if ( $woo_options['woo_home_one_col'] == "true" ) echo woo_embed('key=embed&width=540&height=400'); ?>
                    
                <div class="entry">    


<?php the_advanced_excerpt(); ?>
                    </div>  
                                      
                    <div class="fix"></div>
                   <!--/* <?php if ( $woo_options['woo_content_normal'] != "content" ) { ?><span class="continue"><a title="<?php _e('Link zu', 'woothemes'); ?> <?php the_title(); ?>" href="<?php the_permalink() ?>" ><?php _e('Zum Deal', 'woothemes'); ?></a></span><?php } ?>*/-->


<div class="date-comments2" style="border-bottom:0px; border-top:1px solid rgb(202,202,202);">
                      
<p class="fl2"><a href="<?php the_permalink() ?>" style="color:#3e8bb7;">Zum Deal</a></p>
                    <p class="fr2">Kategorie: <?php the_category(', ') ?></p>
                    </div>
        
                </div> <!-- end .box -->    
            </div> <!-- block -->    
                                     
            <?php if ( $counter == 0 && !$is_paged && $woo_options['woo_home_one_col'] == "false" )  { ?><div class="fix"></div><?php } ?>    
                    
            <?php endwhile; ?>
            <?php endif; ?>
            
            <div class="fix"></div>


            
<?php if(function_exists('wp_paginate')) {
    wp_paginate();
} ?>
            
        </div><!--/centercol-->


<?php get_sidebar(); ?>


<?php get_footer(); ?>