Experienced the same... but for some unknown reasons/actions/restarts/clicking all over the place/hitting esacpe, it came alive and works just fine ever since (I'm using a 2009 MacBook Pro) with OSX 10.9.3
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.
Experienced the same... but for some unknown reasons/actions/restarts/clicking all over the place/hitting esacpe, it came alive and works just fine ever since (I'm using a 2009 MacBook Pro) with OSX 10.9.3