I updated to w3 total cache 0.9.2.6 and now I'm unable to get caching of xml files to work. Checking the footer of post-sitemap.xml (generated by the yoast seo plugin) say:
<!-- Performance optimized by W3 Total Cache. Learn more: http://www.w3-edge.com/wordpress-plugins/ Minified using disk: basic Page Caching using disk: enhanced Served from: www.domain.com @ 2013-02-05 10:25:30 by W3 Total Cache -->
But when reloading the page (I'm not logged in) I get a new timestamp.
What could be wrong?