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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's really weird - seems like something that happened with an older version of the Web IDE. You're definitely using the Web IDE from the Chrome store? Not an older version from somewhere else?
What type of computer are you using? Is there any chance you could try it on a different one just to rule that out?
I'll try and update the Web IDE today so it gives some better diagnostic information about what's going on when flashing fails...