Microsoft have updated the Android Xbox Music app fixing issues on Android 4.4. The update earlier this week added offline playback via playlists to the app and it looks like the update has causes issues with devices like the Moto X and the Google Play edition of the Samsung Galaxy s4. The update fixes streaming playback on Android 4.4 devices, there is still an issue with offline playback which Microsoft are still investigating.
• Bug fix to enable streaming playback on Android 4.4, impacting a range of Motorola devices, such as the Moto X, G and the Samsung Galaxy S4 GooglePlay Edition. We’re investigating a fix to enable offline soon on these impacted device