vudu, so the podcast in question is showing up in the "Music" section of your library instead of the "Podcast" section?
It's not a problem with my library--it's a problem with my iPod. I don't have a podcast section under my iPod (in iTunes) and it's not showing up in the music section. As far as iTunes knows the podcast isn't on my iPod at all!
I've determined that the problem is caused by podcasts edited with Audacity. RFN usually doesn't show show up because that's what Greg uses to edit the podcast. But when Karl edits them using Garageband it shows up just fine in iTunes. It's the same way with Newscast--all episodes before #12 won't show up in iTunes but when Andy switched to Garageband for episode 12 and beyond they appear just fine.
It's really weird.