For some reason, I can't stream my Play Music app from my phone to my Chromecast on my TV. I'm able to stream Netflix and Youtube perfectly fine, but the Play Music app doesn't have the little icon at the top of the screen to send to Chromecast. I have a Motorola Droid Razr Maxx running stock 4.1.2 JB and the latest version of the Google Play Music app version 5.1.11106K.749200. I have the same version of Google Play Music on my N7 tablet and from there, I'm able to stream music to Chromecast without any problem. Any ideas?