[support] Upgrading template from 5 to 7 problem

I have moved a custom template from a Drupal 5 installation and added it to a bare bones Drupal 7 site. I've run into a few issues, of course, but the most vexing for me right now is the inability to get the main content to show render($page['content']); Doesn't produce any output. Here's the line of code in the template file: <?php print render($page['content']); ?> If I go to the user login page, for example, it doesn't show the form. I can get the tabs to show. Doing a quick top-level dump of $page['content'] produces the following: system_main => Array #sorted => 1 #theme_wrappers => Array #region => content #printed => 1 #children => Any hints greatly appreciated. John