MS2 blocs with bluetooth-device output (no "play"-fonction ??)

Dear,
Discovered Musescore 2. Wonderful!

Only this: on my Mac - Capitan Musescore 2.0 only wants to send audio
through micro- or plug-output, and blocs if used with a bluetooth device (I
use Bluez 2S by Aftershokz) ??
The simple play-fonction - and the moving bar wit it - isn't operational ??

A pity, because that's the combination I do all the time.
I miss something?
A solution?
Thanks very much!
Marc