With the advent of the new cards from NVidia (in this case the video cards 7x and above), any attempt to work in two screens in MotionBuilder ended terrible slugs. So finally I managed to find a way out of this situation – RivaTuner Softquadro. In other words, to work in a professional 3D graphics packages, you must either be owner of the line card Quadro, or to the existence of a professional card emulation, which in fact lead to a solution of the problem multidisplay draw.
Incidentally, the operation of such a recognition of my GeForce 8600 GT as a Quadro FX 1700 has a very good gains in productivity and quality of rendering in Maya and 3dsMax.
You have to download RivaTurner – http://downloads.guru3d.com/RivaTuner-v2.24-download-163.html
Then you have to download latest NVidia Quadro drivers.
Run RivaTurner and go to the low level settings.
You have to go to the NVStrap tab, and enable it.
After that, you have to set up settings as at the picture below. Here you can find a home consistent with the professional video card http://www.thg.ru/graphic/nvidia_quadro_fx_5600_amd_firegl_v7700/index.html
in my case NVidia GeForce 8600 GT – Quadro FX 1700
Happy and productive your professional work!