marketpress: mp_productlist.php

I copied page.php to mp_productlist.php in my active theme. When I go to .../store/products/ without mp_productlist.php in the theme folder, it shows my products. However when I upload mp_productslist.php to the theme folder, it does not show any of my products, even though page.php and mp_productslist.php are identical. ANY IDEAS? Thank you