I got model from MAX6.0 and I used max2mdl exporter. And I use GameStudio Pro 6.60 and 7.04.
And i used .bmp skin in 3D MAX for all models.
In model editor (MED) the model looked correctly also in 3D MAX.
But in level editor (WED) it looked strangely. Actuslly it looks correctly in 3D View in WED. But it looks strangely when I run.
I think the problem is about Z-buffer.
When I run the level with this model (teacher), right leg is appeared ahead of left leg where overlaped part, but left leg is actually ahead of the right leg.
See image below. Also you can download and check the moedl in MAX, MED, WED level with sample file that I upload.

[image & file download]http://novel.hanyang.ac.kr/picture

At first, I think the problem is about normal that had wrong direction, but it was not all. I could not understand this condition (leg) with wrong direction of normal.

Thank you for your concern.

I've had this problem too. It seems like the normals are flipped,
or that there is some weird alpha chanel thing going on,
but it still happens even when I save the.bmp files as 24bit.
I never have figured out why this happens, but I do know how to fix it.

First save the .bmp you are using in Max to a .pcx file. You can't
use .pcx images as a diffuse map in Max, so you'll just need 2 versions
of the image.

Once you have exported the model, open it in MED, select File->Skin Editor.
From the Skin Editor select File->Import->Skin Image. Browse to the
.pcx file to load it. Save the model and it should look right when you
run it in the engine.