bugs in A-Frame 0.7.0?

[smurfer]

the demo code under "Basic usage" does not work:
core:schema:warn Unknown property rotationOffset for component/system windows-motion-controls.

when trying to set an event listener to a toggle-button in my own code,, like
document.querySelector('#toggleRotate').addEventListener('change', function () {
console.log("toggled");
});

i get
Uncaught TypeError: Cannot read property 'addEventListener' of null

document.querySelector('#toggleRotate') returns

as expected

But as I am just learning - may be I am doing something wrong?