Please clarify what exactly the issue is. Your last comment indicates that you can stream in your vehicle.
Ok let me clarify.
When I get in my vehicle and start up the engine, the car doesn't allow me to play any music from my phone when using the iDrive interface. I cannot use the iDrive (BMW's infotainment system) to play any kind of music whatsoever. When I search for music using iDrive (going to playlists for example) it will sometimes show the playlists that I have created on my phone (I use music and music app), but when I try and select the song to play, nothing happens.
Only when I open the music app on my phone, and select the song I want to play can I stream the music to my car. Not the other way around (cannot select and stream a song using iDrive).
Bluetooth phone calls work just fine, as does SIRI from the iDrive.
Seems to be only a Bluetooth audio problem (again---only after updating to ios9, and only unidirectional)