The same thing happened to me too, but only one colour flashes though for a spilt second and disapears and reappear after a few seconds . it turns out that you have to profile switch (you can find this in your in struction book that comes w/ the mouse). for me it was the middle button behind the scroll button + the button on the left side of the mouse, farthest from the front of the mouse. Not sure if this is relivent to your question, but i hope it can help you anyway!