No playback from my MacBook Pro to Bricasti M1


My digital front end consist of a Sim Neo 260D transport via balanced AES cable and a MacBook Pro via USB into a Bricasti M1 DAC. Until very recently everything worked great, but now I can't get any playback via the MacBook Pro (cd works perfectly). I tried a different AES cable without any result. 

The M1 no longer recognizes the M1, thus sound only comes out of the MacBook pro's own internal speakers which obviously isn't what I'm looking for. Said another way, the M1 no longer shows up on the MacBook pro's list of available devices.

Anyone encounter this sort of issue? I've reached out to Bricasti and await their response but in the interim- HELP! Your thoughts are appreciated! 
128x128zavato
Your Macbook Pro probably reset to the external speakers. It happened to me a long time ago. If I remember you go into the Macbook audio settings and set it appropriately.

Went into system preferences then sound on the MacBook Pro - it's not letting me do anything but the internal speakers