normals, flipped faces etc. issue

Hello,
I'm having an issue with a model I'm creating in 3dstudio max 2012.
The normals/faces of a part created with a symmetry modifier flip (or at least act in a strange way) when exported to fbx and opened in 3dsimed. Then, In the Assetto Corsa showroom such parts look fine but in their shadow is not projected as if they where transparent !
In 3dsimed I've tried out reversing and double faced but none of these solved the problem...
As you can see in the picture the square panel has no shadow, and the light passes through.

Has anyone experienced this before ?
Thanks...
la foto.JPG
 

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