April 30, 2014
Today I just realized my site map had gone down to 18 entries. It should be at about 350.
I looked at my settings, and things seemed normal. Reset the sitemap to defaults just in case. Rechecked – it added some more (because I had categories unchecked) but the majority of my site, which is made up of custom post types, was not in the index.
So I unchecked everything except two custom post types. Updated…and BOOM. The sitemap was loaded back up.
So….not sure what the offending setting is exactly, but some combination of checked boxes makes the sitemap completely drop custom post types.
January 5, 2012