[Tutorial] WordPress Custom Query Pagination for Category / wp_pagenavi Plugin

Ok, after searching hours of hours to find a solution.
I present you my solution with custom query and category with wordpress 3.5

// if paged doesn′t work - try >> $current_page = (get_query_var('paged')) ? get_query_var('paged') : 1;
$current_page = (get_query_var('paged')) ? get_query_var('paged') : 1;
// get category name
$cat_name = get_category(get_query_var('cat'))->name;

		$args = array(
		   'category_name' => $cat_name,
		   'posts_per_page' => '4',
		   'paged' => $current_page,
		 );
	}
$my_query = new WP_Query($args);
while ($my_query->have_posts()) : $my_query->the_post();
$do_not_duplicate = $post->ID;
?>

<!-- your loop here -->
<?php the_title(); ?>
<!-- loop end -->

<?php endwhile; ?>
<?php if (function_exists('wp_pagenavi')):
 wp_pagenavi( array( 'query' => $my_query ) );
endif; ?>
<?php get_footer(); ?>

If the pagination generates error pages again, try this method together with our custom query above:

1. Login to your wp-admin
2. Click on “Settings”
3. Click on submenu “Reading”
4. Change “Blog pages show at most xx Posts” to 1

After changing this value – Your custom query pagination should be fine!!! ??