I am having this issue as well. I can replicate it by opening any camera view and then as soon as I attempt to close the view my cursor disappears and my only recourse is to save, exit, and reopen the plan.
I am using the trial version of X9 that I downloaded today on an Intel core i7 with 16GB of RAM, NVIDIA GeForce 930M on Windows 10.
I'm sure that my graphics card may be a hindrance but it has no trouble with the 3D views panning/rotating/zooming. It's only when I close out of the views that something goes wrong.