OS upgrades are always a nightmare, across all technologies. so let’s figure this out (again, and again)
first it’s important to figure out if the FTDI driver is working, which is the main point of failure.
on Mac there are two drivers-- the built-in default one by Apple, and the FTDI-VCP driver supplied from the manufacturer: http://www.ftdichip.com/Drivers/VCP.htm
to check (on Mac) if your device is being detected, open a Terminal and type:
ls -lrt /dev
and towards the bottom, if it worked, you should see something resembling
tty.usbserial-m0000000
until you get to this step, serialosc will absolutely not work.
if you want to go deep and test the FTDI-supplied driver: http://www.ftdichip.com/Support/Documents/AppNotes/AN_134_FTDI_Drivers_Installation_Guide_for_MAC_OSX.pdf
i’m upgrading to 10.12 right now, will share my results later this afternoon.
if you’re experiencing full failure, please post here with your OS version, machine used, monome device and edition.