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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.
@DrAzzy
The web IDE gets unhappy if you ever reboot or unplug the espruino while it's connected via USB - once in this state, you must exit the web IDE as well as all instances of google chrome and restart web IDE to make it work again. Could this have been the problem?