3d loci not visible

[O Design]

I want to set up some 3d loci to create a 3d site model. When I insert a 3d loci I keep getting the message that "created 3d loci is not visible". VW is set to class none, all classes are visible and the class visibility in the view menu is set to show/snap/modify others. I have tried in plan view, top view, iso view and front view. Same result.  2d loci works fine. 

 

I have tried to set up the 3d loci in a new blank file but get the same result

 

Any ideas what I am doing wrong?

 

thanks 

SOLUTION FOUND

PS   Found the solution -   there is an option for hiding 3d loci in  preferences display  below the  hide show light objects option

Edited February 13, 2020 by O Design
FOUND ANSWER

[Pat Stanford]

Glad you found it. For clarity:

 

Vectorworks Preferences:Display Pane: Display 3D Loci Pull Down.

 

Always

Only in Wireframe

Never