Apple released an update to iTunes, bringing the software to version 11.2.2. The maintenance release fixes a podcast downloading issue.
Apple's brief patch notes:
This update fixes a problem where certain podcasts may download unexpectedly after upgrading and includes several stability improvements.
The update is a 78.1MB download in Mavericks through the App Store. It's available as a standalone updater through the main iTunes site as a 235.1MB download.