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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Have you tried using another computer? It sounds a little like some software on the Mac is 'hijacking' the serial port - sometimes it can happen if your Mac believes that the board is a modem, and tries to connect to the internet with it.
I still don't know quite why that happens, but perhaps if you plug both boards in and then look at settings, you might see some difference in how the 2 boards appear to the operating system.