[Halo PC] PMI weird problem

[haloflames]

Ok so I can PMI elites, grunts, jackles , and all the covenant. However, when I do exactly what I usually do, I can never PMI marines, or armored marines, or crewmen, into the map.

What am I doing wrong? Is there something different you have to do when your putting in marines, armored marines, or crewman? I was thinking maybe because they have different heads or something? The maps work in HHT, HMT, and even spark edit. Its just that as soon as I start my game it goes into an exception.

Help would be greatly apreciated. Anything you possibly can think of please tell me. Thanks.