nVidia GeForce2 MX, nVidia GeForce2 MX 200 and nVidia GeForce2 MX 400 will cause this problem on recent windows versions.
No problems have been reported with the nVidia GeForce4 MX series of chipsets. nVidia's MX lines are low-end chipsets and are not recommended for advanced 3D applications such as Mastercam. nVidia's other GeForce chipsets, as well as the more expensive Quadro line is recommended.
Matt
San Diego, Ca
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)