Ok, i’ve sleep over it and i’ve found the problem.
In the new structure of WP the archive are separated in different pages. You just have to select in Options / Reading / Blog pages: Show at most __ posts how many posts you want to be show on a page. And add <?php posts_nav_link(‘ — ‘, __(‘« Previous Page’), __(‘Next Page »’)); ?> in your main template after the php for your posts and comments. Have a look in your “classic” main template to see the structure.
Next time i will analyse the new template a little better.
Have a nice day everyone.
F.