aizea on "$do_not_duplicate and post__not_in messing with pagination"

Hi,
I have an issue with homepage and pagination. I am trying to to not duplicate a post using 2 different queries. I have a special layout to highlight the last video post and after a loop with all posts from the blog.
I succeeded in not showing twice the highlighted post with information from : http://wordpress.org/support/topic/do-not-duplicate-post-covering-2-queries/page/2?replies=35

But I have a pagination and now, the last post from page 1 is appearing also in first place of page 2.

First loop

<?php global $do_not_duplicate; //NEW DECLARATION in the header part of the code ?>
    <?php $do_not_duplicate = array();
		$my_query = new WP_Query(array(
		'posts_per_page'	=>  1,
		'order'	=> 'DESC',
		'orderby'	=> 'date',
		'meta_key'	=> THEME_NAME.'_main_slider',
		'meta_value'	=> 'yes',
		'post_type'	=> 'post',
		'ignore_sticky_posts '	=> 1,
		'post_status '	=> 'publish'
		) );
		?>

<?php if ($my_query->have_posts()) : while ($my_query->have_posts()) : $my_query->the_post();
			$do_not_duplicate[] = $post->ID;
			 ?>

Second loop

<?php
 function homepage_news_block_5($blockType, $blockId,$blockInputType) {
		global $blogStyle;
		global $do_not_duplicate;
		$cat = get_option(THEME_NAME."_".$blockType."_cat_".$blockId);
		$count = get_option(THEME_NAME."_".$blockType."_count_".$blockId);
		$pagination = get_option(THEME_NAME."_".$blockType."_pagination_".$blockId);
		$blogStyle = get_option(THEME_NAME."_".$blockType."_blog_style_".$blockId);
		$paged = get_query_string_paged();
		$args = array(
			'post_type' => "post",
			'cat' => $cat,
			'paged'=>$paged,
			'posts_per_page' => $count,
			'post__not_in' => $do_not_duplicate

		);
		$my_query = new WP_Query($args);
		$counter = 1;

?>

I didn't find an answer on forums so far, someone could help me, please ?
Thank you for your time