Category view not listing product. Need query?

Hello,

I'm using a third party theme. When we select a category, it doesn't show any products.

Looking deeper, the have_posts() function returns nothing.

We've duplicated the page.php to mp_category.php and will use the function mp_list_products().

My question is, what would be the query we'd put prior to if hav_posts()?

I'm open to other suggestions as well.

Thanks in advance.