Hi Gerome.

Maybe this can help on filtering.

In the main_page=specials, main_page=products_new, main_page=featured_products the filtering provided in the includes/modules/ new_products.php , featured_products.php, specials_index.php don't working.

But if you add the filtering function in includes/templates/template_default/templates/tpl_modules_products_new_listing.php
line 23 :
$products_new = $db->Execute(cat_filter($products_new_split->sql_query));

the same for the templates featured_products and specials the filtering is working ok.
But now all products are displaying twice. .
Do you have any solution on this please?.