Symbols Invisible in 3D

[Sky 17]

I'm using Vectorworks 2021 on Mac OS Big Sur.

I'm imported a Kohler sink and an American Standard faucet from the Vectorworks Library, but the symbol is invisible in 3D.

I can see it in wireframe and hidden line, but it can't be seen in OpenGL or Renderworks.

The faucet is even stranger, because some parts are visible and some aren't. All of them are generic solids. 

 

These are the symbols I've had a problem with so far. 

Sanitary Fixt Am Standard Faucets 4332.001

Sanitary Fixt Kohler Sink K-3943

Sanitary Fixt Kohler Sink K-3936

Sanitary Fixt Kohler Sink K-3821

[Pat Stanford 1,631]

I just downloaded the K-3943 and it shows in OpenGL just fine. The symbol seems to be simple objects all in the None class and the symbol itself is in the Plumbing-Fixtures class.

 

What happens if you copy the sinks into a new file and render in a 3D view. If that works, can you duplicate the file and simplify it to have just the symbols and post that here for us to take a look.