[support] fusion/acquia marina: how to override the page.tpl.php with costum page-contenttype.tpl.php

Hi, I'm trying to theme the pages that shows the node generated by content type called "project". I saved a copy of the file page.tpl.php as page-project.tpl.php, and my changes to it does not effect the theme. I tried to do it in the theme, in the fusion themes... nothing works. the weird thing is that it works great with costum node.tpl.php and even with page-front.tpl.php !! All my themes are in sites/all/themes thanks a lot! Lio