It's not clear that this is a Vista issue only, but I'm on Vista as well, and when the issue first occured with 11.1, I quickly reverted to 11.0.5.5, and I'm still on it, I keep watching this post thread carefully before considering changing to any new version. What I'm reading here is not the "fixed" that was claimed earlier. There are still way too many "..You definitely do NOT want to click the cloud.." and "...I can somewhat manage the zombie podcasts.." for my liking. I just like the way I am able to manage my podcasts today. It should not be so difficult to perform the simple operation of deleting podcasts you are done with.
It would be nice if the Apple designers read this forum and saw that people are having issues. This is not the case of operator error, but major design snafu. They have now released 3 new versions without fixing the problem. I'm ready to turn off "check for new version", and check back manually in 5-6 months. In the past they have added some nice features, so I would consider upgrading, but it should not be so painful.
Thank You to those reporting on this thread, I rely on you excellent comments.