OK, as I told you, I'm updating the feeds of this blog to use Feedburner. You shouldn't need to take any action, but just in case it doesn't work, update your feed reader to use the new feed URL: http://feeds.feedburner.com/Librador.
I've also removed all the choices of different feed formats (one format is enough!) and the possibility to subscribe to a feed for a specific category. Let me know if that's a problem.