I have zero issues with YouTube playing... that said, if you want to uninstall this update, you need to first go into Device Administrators and uncheck Android Device Manager. Then go to Apps and find Google Play Services. Then hit Uninstall updates. You'll go back to the stock version that's installed on your phone. Eventually the latest official version will roll out to your device, or you can sideload the old version you had. You can get it at gappsearly.com
. Don't forget to reenable ADM.