Hey Guys! So for some time my Mac Pro has worked flawlessly with my Bang & Olufsen A9 speaker - via airplay.. But then today it suddenly don't let me select other than the build in speaker in the Mac Pro tower.. Both my iPhones - Macbook Pro and Macbook Air can find and play the A9 speaker so there is no problems there.. The Mac Pro is a 2009 - 2.66 Quad-Core Xeon, 4 TB, 16 GB ram, Running Mac OS x 10.9 and the latest version of iTunes - 11.1.3 (8). The Mac Pro is running on hooked up to the Airport Extreme and Modem, and there is nothing other than the Mac Pro that don't see the A9 B&O speaker.. Any suggestions is welcome - I have tried restart and so on - and to find it in settings - but under "outgoing sound in system preferences" there is no sign of the speaker either.. Only my Apple tv show up under external devices.. Heelp ?