I have the same problem. I just have a Pi 3 (not a B+).
I had this message :
If you connected Bluetooth Speakers, make sure to set the soundcard of your audioplayers to bluetooth as audio output! You need to restart your Audioplayer if the Bluetooth Device changed.
If you connected a Smartphone to stream to Squeezebox Server, NO further setting to your soundcard is needed (do NOT set your soundcard to bluealsa)!
Device 84:CF:BF:8A:9F:7A Fairphone FP2
trust 84:CF:BF:8A:9F:7A
Changing 84:CF:BF:8A:9F:7A trust succeeded
pair 84:CF:BF:8A:9F:7A
Attempting to pair with 84:CF:BF:8A:9F:7A
Failed to pair: org.bluez.Error.AlreadyExists
connect 84:CF:BF:8A:9F:7A
Attempting to connect to 84:CF:BF:8A:9F:7A
Failed to connect: org.bluez.Error.Failed
quit
Name: Fairphone FP2
Address: 84:CF:BF:8A:9F:7A
Icon: phone
Class: 0x5a020c
Paired: 1
Connected: 0
I made the Beta update and I still have the exact message and no connection with my phone (fairphone 2)