Couldn't select it but I'm using WordPress v. 3.4.1.
Anyway, updated the original WordPress SEO plug-in to latest version, installed new- News plug-in. At first all sitemaps were blank, then after re-saving my settings it generated the regular site maps
However my news-sitemap is blank, webmaster tools says it is a "General HTTP error: 404 not found" error if that helps. Any help would very much appreciated :)