Marketpress - theme wrappers and locate_template

Hi, I am using marketpress with the delimondo/seafresh theme and child theme blackangus and I am having problems with custom marketpress theme pages.

The theme I am using uses theme wrappers as in:

The problem I am experiencing is that in my mp_productlist.php theme file pagination does not work (and mp_products_filter() does not work). If I rename my mp_productlist.php to page.php it does work as expected. So it appears the theme wrapping of theme template files is affecting things. I note that in marketpress.php different add_filter calls are made depending on if the mp_* custom theme files are detected or not.

It looks like certain wp objects are missing if I use mp_* theme files. Any suggestions on how to address this? I would really like to paginate my product listing pages.