I have encountered a similar problem where the sitemap.xml, urllist.txt, ror.xml, and mobilesitemap.xml are generated, but the sitemap.html files are unaltered from the previous crawl. The only thing that I changed from the previous crawl was to check the, "use temporary files to store crawling progress " box. I double checked the permissions and owner/group settings. All generated sitemap files (xml, txt, html) were set to 0666 and had the same owner/group values. The only other thing that changed was the pages number. We recently added 14,000 URL's to our already 10,000 URL sitemap. Any Ideas?