Hello, first off, loving the plugin.
My WP is all up to date and so are my plugins, but the auto generated NextGEN sitemap doesn't work properly yet.
Here is a link to the auto generated NextGEN sitemap created by your plugin: http://www.lsehair.com/ngg_tag-sitemap.xml
The date for "Last Modified" says: 1970-01-01 00:00 and the links don't work, does anyone have any advice for me please? Thanks.
I think the main page sitemap is working correctly, see: http://www.lsehair.com/page-sitemap.xml