I have sometimes this problem - look at attachements. After import some style from library, it look like this or any other weird color, every time different but bad. Then I hit F9 for render and after that viewport repair itself and look good. I can stop the rendering and viewport is good too. Dont know where is a problem.
Using max 2014 x64, vray 3, nitrous viewport, but doesnt matter if realistic or shaded viewport.
Thanks for any tips.