Based on the above, it seems maybe some of your MAC's settings are incorrect. The link below is from Ayre Acoustics and should be helpful in reviewing your MAC settings to output to your Bricasti DAC:.
https://www.ayre.com/usb-dac-apple.htm
The above link references the Sound settings and also the Audio MiDi setup settings. It is possible that some software upgrade might of changed these settings.
Please let us know if any of the above work.
https://www.ayre.com/usb-dac-apple.htm
The above link references the Sound settings and also the Audio MiDi setup settings. It is possible that some software upgrade might of changed these settings.
Please let us know if any of the above work.