Hi! We have installed 'PWT sitemap' on one of our websites. On this site we also use the HeadTag plugin.
When we create a menu item to an XML sitemap this menu item should produce a XML file, but in stead it shows the menu items in a HTML template view. I contacted the developer of the XML extension and they said the headTag plugin is somehow causing this. And indeed when we disable the headTag plugin the XML file shows in the browser, and when the HeadTag plugin is enabled the HTML template page shows up.