Tapi you are having the same problem with 3ds max9 and Windows 8.1, the only thing you can do is to use Windows key +D key, twice, this will bring back the viewport to the normal state. this happen when you use the quad menú. that part of the screen will freeze.
I think "no" was a good idea to installation, windows 8 gives problem textures to 3ds max, to relocate textures after an installation also gives problems.
I'll try with the windows 7, I think it will be fine.
Thank you all for the help.
Really Windows 8,1 was unnecesary for us. I noticed that you just have to load a texture in the material editor for this problem begun. very courious, and annoying.anyway I never have used the quad menú too much indeed.