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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
That is odd - I'm pretty sure I've had people doing exactly that and it's been fine.
The other thing you could try is http://www.espruino.com/Puck.js#hard-reset (do it after installing the espruino firmware version you want to use)
Windows always tries to create a secure connection to the Puck for Bluetooth HID, which means that encryption keys get stored on the Puck. I guess it's possible that something has gone wrong somehow and the Puck has the wrong keys stored - doing that hard reset should remove them and might help?