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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
Well, just updated and same problem. Not sure what to suggest - there's a post on mbed from someone having similar problems, showing how to set up VirtualBox with Windows (and forward the USB devices).
Out of interest, do you have some antivirus stuff like Sophos installed? I'm stabbing in the dark here, but that's about the only thing that we've done to Marianne's Mac recently that could have caused problems apart from a software update.