Marketplace Template Page

Hi,

I have been trying (unsuccessfully) to create a template page for the mp_global_products.php page, so that the products would be displayed in a grid form. I found this: http://www.transformationpowertools.com/wordpress/multi-column-wordpress-template and thought it would work, as I thought that the products were treated as posts in the global products page. Anyway it didn't work, as first nothing was displayed, then the actual posts were displayed.
So I tried just using the page.php code in the mp_global_products.php file with nothing added, and found that the products don't display, it was another blank page.
So I just wanted to ask, am I right that it is the page.php file that marketpress uses to display the products? Then why it displays nothing when I use it as a template? How would I go about getting the products to display?

Thanks so much!