We have been receiving reports that many producers are having trouble getting episode content to update in the iTunes store. We have been in contact with iTunes regarding this issue and they are currently working to isolate and rectify the issue. They have confirmed that the issue is not related to the producer’s RSS feed or the producer’s chosen host.
If your show's RSS feed is valid, you see your content available as a subscriber, and iTunes hasn't updated your show in the store in at least 3 days, you are likely being affected by this issue. Note again that this is not isolated to Libsyn feeds, so if you are using another method to generate your feed, you may still be affected.
The only way to fix the issue is to have iTunes index your feed manually. To request this, make sure you have your RSS feed URL and the URL to your show in the iTunes store and contact: