I am upgrading from 1.3.9h in which using the search feature returns results based on a products_model search. I don't remember making any code change to achieve this. In 1.5.5, I'm not getting any results. It appears I should get results after looking at /includes/modules/pages/advanced_search_result/header_php.php

What could I be missing have 0 results? products_model is populated in the database.

Thanks