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I have a problem with a custom WP_Query. I want a page with all posts with a specific tag. This is the code I'm using:

//save old query
$temp = $wp_query; 
//clear $wp_query; 
$wp_query= null; 
// The Query
$wp_query = new WP_Query();
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$args = array( 'tag' => 'concurs', 'paged' => $paged );
// The Loop
while ( $wp_query->have_posts() ) :
[some code that displays the title, excerpt, meta-info (author, category, date) and thumbnail] 
      <?php endwhile; ?>
<?php posts_nav_link(); ?>              
//clear again
$wp_query = null; 
$wp_query = $temp;  

The problem is that when I switch to page 2 or 3 I get the same 10 first posts. What I am doing wrong?

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Have you considered using the pre_get_posts filter to modify the main query instead? It would be significantly faster, an the code would be much smaller/simpler than discarding the main query and reinventing it, doubling the work and page load in the process – Tom J Nowell Apr 7 at 21:57
You're right, at that moment my WordPress knowledge was limited, now I know I should have used the pre_get_posts filter. Go ahead an post an answer and I'll mark it as correct, hopefully it will help others to not make the same mistake as I have. – George Grigorita Apr 8 at 13:42

Your query has no paging.

You need to tell the query what page your on so it can get the right results for you. You can grab the 'paged' query_var for this.

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Thanks, I've included the paged query_var in the code but it's still not working [code updated above]. – George Grigorita Feb 3 '13 at 15:37

Finally I've figured out the correct coding for this problem:

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$wp_query = new WP_Query();
$wp_query->query('tag=concurs&posts_per_page='.get_option('posts_per_page').'&paged=' . $paged);
<?php if ($wp_query->have_posts()) : ?>
    <?php while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>  
[code for title, author, category, meta-info etc] 
<?php endwhile; ?>
 <div class="next-prev"><?php posts_nav_link( ' ', '<img src="' . get_bloginfo('stylesheet_directory') . '/img/pagina-precedenta.png" align="left" />', '<img src="' . get_bloginfo('stylesheet_directory') . '/img/pagina-urmatoare.png" align="right" />'); ?></div>  
<?php endif; ?>         
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