Screenshots: http://i.imgur.com/wdfRMOd.png http://i.imgur.com/KJJRjzp.png
Here the video https://www.youtube.com/watch?v=UKY3scPIMd8
The url of the video's name explains about the YouTube Data API upgrade: "As we upgrade the YouTube Data API to bring more features, we’ll begin shutting down the old version on April 20, 2015. This will result in the current YouTube app not working on certain device models from 2012 and older." Link: https://youtube.com/devicesupport
Confusing stuff.