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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
The only other thing I can think is maybe it refuses to connect to a device that doesn't have link security enabled. You could follow http://www.espruino.com/BLE+Security#passkey-pin-pairing and add:
NRF.setSecurity({passkey:"123456", mitm:1, display:1});However if that were the issue I think you'd still be able to see the device listed, you just wouldn't be able to connect.
I'm afraid other than that I'm out of ideas.