I have used your excellent plugin to create a few widgets having to do with my podcast. In both instances a seemingly random episode of my podcast appears in a player within the widget (both as a sidebar and when the widget is in widgetized page).
Take a look at orhistory.com The "Subscribe to Kick Ass Oregon History" sidebar is one usage.
Is it possible there is a conflict with the plugin I use with my podcast http://wordpress.org/plugins/powerpress/? Perhaps 'the_content' is the problem somewhere?