A good picture tells more than a hundred words:
The position light is masked by the model, which is behind it (I even exagerated the distance of the light and the surface to be sure).
I had this problem once, on my first mod, but without understanding what changed, it worked from a version to another. And now, months later, I notice the very same problem on a new model. But this time... it just don't wanna disappear.
I checked the canOcclude on FireGeo, Geo, HitPoints, etc... but it seems to come from elsewhere. The chopper texture is a PAC without any alpha... I just don't get what's wrong.
Thanx for any tip.