Ok, I've tested this a few times...you start the game, start a new game, and then can't pan the camera using the arrow keys, but if you quit the game, and then immediately start a new game, you can. Not sure what is causing this, but this has happened to me three times now. I have been trying to reproduce this problem, but it is not consistent. If/when it happens again, I will try a couple other things such as using the camera toggles on top of the screen to see if that will 'unlock' the camera and allow me to pan.