Flat shading problems with Milkshape 3D

[Muffinmix]

I am following Trader's Flat shading guide (http://www.blockland.us/smf/index.php?topic=20807.0) but every time I always get the same result: Everything is invisible except for a single polygon of the weapon, that polygon IS flat shaded though. I am using 3 different materials, and a fourth one for Animation sequencing.

I tried Regrouping the three groups and something interesting happened. One of the Polygon groups would appear when in 1st person mode, and another group would appear in 3rd person mode, but the first group would disappear. The last group would remain invisible.

Simply put, I want to flat shade my model, but it doesn't work. Version of MS3d is 1.7.10. I need help.

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[Muffinmix]

Edit: Tried the latest version, and the Beta 1.8.1 version and the same thing happened. I narrowed to problem down to Torque DTS Plus exporter.

Edit 2: Problem solved thanks to MasterLegoDude's Making a Weapon/Vehicle thread.