Using Version: 4.0.0.5. The silkscreen outline for certain components is not visible in 3D preview. If I Ungroup the component, then the silkscreen outline is visible in 3D preview.


silkscreen visibility 1.jpg

Also, If I export the 3D view as a step file, the silkscreen layer is not showing up ...

Have a look at
http://www.pcb-3d.com/membership_type/free/
There may be something there to help you.