I just tested this on Windows with the current Web IDE from the Chrome Web Store, and it works great for me.
However, the 'Native' IDE (the one you install with an installer, that is needed for Bluetooth LE on Windows) does seem to have a problem. Could you let us know which one you're actually using?
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.
I just tested this on Windows with the current Web IDE from the Chrome Web Store, and it works great for me.
However, the 'Native' IDE (the one you install with an installer, that is needed for Bluetooth LE on Windows) does seem to have a problem. Could you let us know which one you're actually using?