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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
Wow, that's strange. And you're uploading the exact same code to the others that are working fine? I find it really odd that one is having problems and the others aren't.
Could you try installing the firmware from here? It's the new (beta) USB HID firmware and it's got totally re-written USB - it may help to solve your problems.
Also, can you take a quick look at the resonator (tiny metal box right at the end of the board) and check that it looks ok? That's about the only hardware-related thing that I can imagine could cause a difference.