I can't get my first "hello world" game working. I'm following two similar tutorials, and cannot make the "camera" move. I built a hollow box, with and without a ceiling, with default texture, and the arrow keys do not pan or zoom the view. I've done this with two different tutorials; one includes an "add position" step and the other does not. I've tried it on two computers (the first is a laptop and I was suspicious the arrow keys might be mis-mapped). Any suggestions as to what I've overlooked?