Brick co-ordinates change when I change the model viewing angle.

[Travis Cobbs]

You're rotating the entire model, instead of rotating the camera. I don't know off-hand how to rotate the camera in Bricksmith, but it appears that if you perform a rotate operation with nothing selected, it acts as though everything was selected. Look around in the Bricksmith UI (or help) for camera view/rotation settings. There are probably pre-set views somewhere (left, right, top, bottom, etc.). Also, doing a quick scan of the Bricksmith tutorial, if you hold down Command+Option will dragging in the model view, it will rotate the view.