Upgrading to Beta-161219 did not solve my problem with streaming TO the LMS. But at least it helped streaming FROM the RPi to my UE Boom 2 speaker.
I tried a Google Pixel (Android 7.1.1), an iPhone 5S (iOS 9.3.5), and an iPad Mini (iOS 6). Only the old iPad Mini showed a pairing dialog, when I clicked on the „Reconnect“ button in the max2play GUI.
Playback on my Raspberry 2 B is choppy although the load average is below 3. Maybe the only solution would be to upgrade to a RPi 3 B?
Maybe the WaveInput plugin plus an external USB soundcard is a better solution. So I could also connect a Chromecast Audio which might be more useful for streaming audio from Android.