gamepad analog sticks not working

[Rybar]

gamepads[n].sticks[n] values remain undefined at runtime with stick activity, buttons are working fine.

Here's my little test app:

playground({

  //container: exampleContainer,

  gamepaddown: function(data) {

    this.button = data.button;
    this.gamepad = data.gamepad;

  },

  render: function() {

    this.layer.clear("#0af");

    var text = 
      "last pressed button is " + this.button + 
      " on gamepad " + this.gamepad;

    this.layer
      .font("24px 'arial'")
      .fillStyle("#fff")
      .fillText(text, 16, 32)
      .fillText(this.gamepads[0].sticks[1].x + " " + this.gamepads[0].sticks[0].y, 16, 96);

  }

});

I'm on Windows 7, with a Microsoft wireless dongle, xbox 360 gamepad, Latest Chrome browser.