The test was to isolate the problem to Rhino or to the display driver/card combination.
Since the scrambled display goes away with accelerated hardware modes off, it is conclusive that the problem is in the card and driver combination.
I have not heard of this sort of problem before with that Nvidia GT 750M.
I personally have a GeForce GT 750M on a Dell XPS all-in-one system.
It works beautifully driving a 27" touch screen display and a second 24" monitor on an HDMI cable.
I’m running driver 126.96.36.19960 from 9 August. I have not updated it since I am not having any issues with it.
I started with 64-bit Windows 8 and now and running 8.1.
I would try the older drivers and if the problems persist, then I think you have a bad video card.