iTunes 12.2 broke the shared library feature from Mac to Windows
Apple removed Home Sharing for music with 12.2. The theory I've read on the Apple forums is that this is one of the concessions they had to make with the music labels in order to get Apple Music off the ground. 

Here's a cnet article that mentions the feature change:

http://www.cnet.com/news/itunes-users-hit-stumbling-blocks-with-arrival-of-apple-music/

Edit: Home Sharing for music was indeed removed with the latest updates. 

http://arstechnica.com/apple/2015/07/eddy-cue-apple-working-to-bring-back-itunes-home-sharing-for-ios-9/