iTunes 11.3.1 addresses a problem where subscribed podcasts may stop updating with new episodes and resolves an issue where iTunes may become unresponsive while browsing your podcasts episodes in a list.
For information on the security content of this update, please visit: https://support.apple.com/kb/HT1222
iTunes 11.3.1 for Windows SHA1= 74487e02ae22ffbfb6e6f5c4f63c53bb4d1f9f3f
iTunes 11.3.1 for Windows 64 SHA1= ac65d64d9006ad8a439270e7d27bc3f49fab6043
iTunes 11.3.1 for OS X SHA1= 5e82560c3fd7175c5e4231df12bfe8b64580c09f
To download iTunes 11.3.1 for Windows 64 bit: support.apple.com/kb/DL1615.