Ticket #16730: 16730.quick-n-dirty.diff

wp-includes/query.php

@@ -1654 +1654 @@
                 }
 
                 foreach ( $GLOBALS['wp_taxonomies'] as $taxonomy => $t ) {
+                        if ( 'post_tag' == $taxonomy )
+                                continue;       // handled further down
+
                         if ( $t->query_var && !empty( $q[$t->query_var] ) ) {
                                 $tax_query_defaults = array(
                                         'taxonomy' => $taxonomy,