I have iTunes 11.0.4.4 and have just installed Windows 8.1 - iTunes seems to work ok, but when I plug the iPhone in (iOS 6.1.4) it doesn't appear and be recognised.
The OS sees the phone and I can copy files from it, but iTunes doesn't react to it.
Are there any known issues with Windows 8.1 - am I paying the price for being on the bleeding edge?