Marketpress: cannot get mp_productlist.php to display anything

I have marketpress installed in multisite. The products page loads fine in page.php. I renamed page.php to mp_productlist.php and nothing loads in the page loop. I also tried renaming archive.php and then index.php to mp_productlist.php and had the same result. I was using a Woo Theme called Canvas with a child theme, so just for kicks I tried the same thing with Twentyeleven and had the same results. Help if you can. Thanks