What's goofy is this - I've been able to run MM3-8 on this system, with this setup, without the slightest problem. It's only been MM9 that has given me issues. I'm guessing it has to do with the 3D graphics.

What's also odd is that it doesn't just freeze and stay frozen. Instead, it only freezes for a bit of time, allows a small bit of movement again, freezes again, movement, freeze, repeat.