I have a strange situation where my Drupal 7 Omega 4 site appears to not be using a page.tpl.php template. The page renders and content appears but when I alter all of my page templates to indicate which one is in use (By adding a "<h1>TEMPLATE NAME.tpl.php</h1> above the "print render($page['content']);") I see nothing in the rendered output on screen.
I have cleared the caches. Many times.
Is it possible for Drupal to somehow not use a page template and still render a page's content? I would have thought not but can't figure out how this could be happening. I'm guessing I'm completely forgetting something quite basic here.
Any help greatly appreciated.