I don't know if this is 3DGS related oder PhysX related:

If I set collision flags and event (http://www.conitec.net/beta/pXent_setcollisionflag.htm) the event is only triggered if the physX ent collides with its initialized body. If I add some more shapes with "pXent_addshape" the collision event is not triggered if the new added shapes collide with something.