How to locate page template in use? 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 "&lt;h1&gt;TEMPLATE NAME.tpl.php&lt;/h1&gt; 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.
You can use the https://www.drupal.org/project/devel_themer module to see what tpl file is in use. You should see the path to your subtheme. If you see the path to the base theme, then your tpl file is not found.