It will disappear if you right-click and drag the mouse quickly off-screen or onto another window and release there.
(including F3 or F4 windows, etc.) Such as if you were using the mouse to move the camera. Typically if you wait a
second after dragging, with the right mouse button still pressed in, the cursor will return to the correct spot.(even if it
isn't visible) But most of the time you will be moving and releasing it very quickly once it reaches the side of the
screen,(or maybe accidentally onto a window) and it will cause the cursor to become totally invisible and you must
restart Orbiter. :p I'm not totally sure if this is what is happening to you though. And what do you mean by 'spot
view'?