I recently updated from 4.1.5 to 4.2.1
I have studio 4.6 Pro.
When i had 4.1.5 unity, i could export OBJ fine.
but now all the OBJ i bring in have this weird transparent thing where you can see the insides and then if you rotate the object or camera around the object, there’s a weir visual effect.
the way i see is that the normals are inverted, in other words what you see transparent means that you are looking part of the mesh from behind.
a way to solve this is going back to DAZ and invert the normals from these transparent parts.
if that is not the case, just try with some other format like .fbx
hope that helps.