Feedburner doesn't update when "scheduled post" publishes

I've searched around and can't find anything on this, so thought I'd see if y'all could help. I am successfully scheduling posts and having them publish - no "missed schedule" problems - but when a scheduled post is published, WordPress does not ping Feedburner, and my feed is not updated. I can manually go into Feedburner and update the feed, but that's a pain (well, it's easy, but I forget to do it! that's the whole point of scheduling posts! :-) ).

Does anyone know of a setting in either Feedburner or WordPress that I need to change to make this work? My 'privacy' settings are set to visible to search engines. Here's the site if that helps in any way: http://thegladdestthing.com/

Thanks for your help!