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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
Just managed to reproduce this - if you open the settings window and close it, it wipes out the data received from the board. So if you just connect and upload it'll be fine - it's just an issue if you connect, enter settings, and then upload.
I'll fix it for the next IDE release.