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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
It sounds crazy, but it's almost certainly because you have a broken Micro USB cable - can you try another one?
The Mac isn't connecting to the Espruino board at all (it'd appear as something called
/dev/tty.usbmodem1234if it was). And when in bootloader mode, the red and blue LEDs light on the Espruino board until it's connected to USB, and then the blue light starts pulsing.There's more info at http://www.espruino.com/Troubleshooting