The module Product filter Module for Zencart works great on my version zen 1.5.0 BUT it will not use the sort when the customer is the advanced search results pages. So, for example, they search for dryer belts and they are at the advanced search results page and then choose the product filter to go by price low to high, it errors out and says no product found. Any ideas?? It works if they go into a category and don't use the search.