The most common problem people have is their theme. Some custom WordPress themes do not contain the necessary WordPress tags that Podcasting requires. Podcasting relies on the header WordPress tag, <?php wp_head(); ?>. Sometimes theme developers forget to put this tag in their theme. To make sure the tag is present, open up your theme's header.php and look for <?php wp_head(); ?>. If that line is not there, add it before the </head> tag.

The Podcasting player will not work if you do not have these tags because the player relies on a small bit of Javascript to function.