Feedreader 3

Most of my feeds work flawlessly. But I have three, all off the same server, which do not update. These are poscasts that are updated pretty much once daily, but the new podcasts don't show up. If I delete the feed and re-add it, the new podcasts display.

URLs are:

http://archive.ihradio.org/podcast.xml?key=cconn
http://archive.ihradio.org/podcast.xml?key=doctor
http://archive.ihradio.org/podcast.xml?key=gol

When I go the these pages, I see the new podcasts in the XML on each page, but not in FR. For example, the last one (Gift of Life - gol) is usually updated once a week. My FR lists the last podcast as 12/28/07, but if I look up the XML online I see one out there from 1/4/08 that is not listed.

Running on Windows XP SP2. Yes, I am behind a company firewall, but my other feeds work fine, so I don't think that is the problem. FR is version 3.11.

Any ideas? Is there something about these feeds which is problematic? Thanks for any information.