Thanks for visiting Apple Support Communities.
These steps can help if the podcasts you've downloaded aren't playing properly:
I can't play a podcast
If you can't play a particular podcast, try deleting the podcast and then subscribing to it again, as follows:
- Click the Podcasts icon on the left.
- Select the podcast episode that won't play.
- Press Delete to delete the podcast.
- Select the title of the podcast whose episode you just deleted (the item with a disclosure triangle next to it).
- Click the Unsubscribe button at the bottom-right part of the screen.
- Click the Subscribe button that appears next to the podcast title.
- Click the Get button for the episode you deleted.
All the best,