Had the same message, only the PC version of it. “Port 1 is in use by another program”, after a recent upgrade to MC 2.8.3! After several hours of trying to track down what “program” was the culprit, finally discovered it was the MC software itself. Don’t remember the exact setting name, (can find out when in front of box in several hours) but in the settings check the one that allows the Avid to be controlled remotely by another system or tape machine. It turns out this somehow was assigned to the port (maybe as a default) after the upgrade. Reset to no port assigned, relaunched, all systems go.
Nick Hrycyk
Digital Image Studios