This used to work but now when I click on the link for sitemap.xml, I get a popup that asks me what to use to open it. (It used to just open in the browser.) So I set it to open in Firefox. Now I still get the same popup but when I click OK, a Firefox window opens and get a yellow page with a red box that says: "Error loading stylesheet: An unknown error has occurred (805303f4)http://www.stcwdc.org/wdcblog/wp-content/plugins/google-sitemap-generator/sitemap.xsl" I've checked and the .xsl file is there. I am using Google XML Sitemaps 3.2.9 and Firefox 20. Why isn't this working anymore?