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But if it needed 3.5, how would GMAX run at all.

But if it needed 3.5, how would GMAX run at all.
I think it has something to do with the wireframe views.
When in perspective mode, the framerate increases, and it seems pretty stable.
In wireframe mode i can even hear a cound in my speakers as it loads while panning in/out.
Time to learn blender I guess!
DX9a comes with FS9, if you have it. I dont remember but DX9b or DX9c comes with FSX but I dont really recall since its been a couple years since I last installed. DX9b really just has a security update over 9a. Not sure what 9c has over 9b.People talk about install Direct x9, run as administrator, or update de opengl versión, sure must be a solution, W8 not should be so different from W7 in this case.
.NET is included with Windows 8.1, like it's included with Vista and Windows 7, but may need to be enabled: see the links in kevintampa5's post above.
You will probably also need DirectX 9.0c runtime, download from Microsoft.
We are trying to help, y'know...
ps you can check which version of .NET you have with .NET Detector

.NET 3.5 is enabled. I think I'll just battle along with the instabilities until using Blender on me next project.
Cheers for the help.