This is a fresh install of XML Sitemap on a fairly new Drupal 7 site. After install XML Sitemap, the module seems to work as expected, except to add pages to the sitemap.
I first visit admin/config/search/xmlsitemap/settings and set the content types that I want to be included in the sitemap with default priority. I do the same for my Menu Links I want included.
I then save the configuration and go back to the "list" of sitemaps. Finally, I run cron to generate the new sitemap. At this point, on admin/config/search/xmlsitemap, I see my default sitemap, /sitemap.xml. Under Links, I see 19, but under pages, I only see 1. This is consistent when I actually open the sitemap to view it (I only see 1 url in the sitemap).
No amount of rebuilding the links or editing and re-saving the configuration, or running cron seems to fix this issue.
Finally, I've tried completely disabling and then uninstalling the XML Sitemap files, and then enabling and configuring them again, which also has not resolved the issue.