/page/2/ doesn’t work

Hi,

I’ve got this on my front page (WP 1.5, Kubrick)

<?php get_header(); ?>

<?php query_posts('cat=1,10'); ?>

<div id="content" class="narrowcolumn">

<?php if (have_posts()) : ?>

<?php while (have_posts()) : the_post(); ?>

...

<?php endwhile; ?>

<div class="navigation">

<div class="alignleft"><?php next_posts_link('« Back') ?></div>

<div class="alignright"><?php previous_posts_link('Forward »') ?></div>

</div>

When I click “Back”, I go to /page/2/, but the same articles are displayed, and the “Forward” link appears.

Options are set to display the latest 2 articles.
Any clues?