@nate Null pointer exception was the problem. Very cool what you have build here! Tracking the tobii paired with the head movement is an awesome feature!
One feature I might request is the ability to disable the “head tracking adjustments” once I have it moderately well trained. Sometime when I like to be jump around to parts of the screen generally and not be as precise. For example when I’m just changing the focus of a window. During these times I worry I am training it poorly.