Thanks for your suggestions Dave.

I figured out it was my drivers that were the problem. I had the new 52.16 drivers installed. I reverted back to the 45.33 drivers and now Maya works perfectly, the viewports refresh properly now so all is good.

Seeing as how I haven't noticed any significant improvements in performance of games etc with the 52.16 drivers, I may as well just stick to the 45.33 drivers until NVidia releases a new drivers version to see if they work.

Thanks again,
QwErTyKb