Not sure if it is a Processing only issue. In any case what happens is the sphere lights up in white but nothing happens.
If I press the move button several times, the sphere turns off but nothing more happens.
Only when I quit the sketch do the messages “Cover the iSight camera with the sphere and press the Move button” and “Move the controller away and press the Move button” finally print.
That's a feature, not a bug ;)
See also the detailed explanation on: