JFTrichard

I had the same pb, seems that it doesn’t work. Hope it will in the 2.7 version.
Till, you can do it this way :

<?php
global $post;
 $postsByTag = get_posts('tag=Actualité');
 $postsByCat = get_posts('categorie=6');
 $postsListe = array_intersect ($postsByTag, $postsByCat);
 foreach($postsListe as $post) : ?>
.....
 <?php endforeach; ?>