Sweep geometry not visible in hidden line viewport?

[hollister design Studio 31]

I made a sweep bowl for a fountain.

 

I want a 3/4 view viewport rendered in 'Hidden Line'.

 

All geometry renders fine except the sweep bowl.

 

No Sweep visible:

 

 

Sweep bowl shows up fine if in OpenGL:

 

 

I read in these forums to :

• set "sweep seg." to 20
• set Hidden Line  'background render settings' 'smoothing angle' to 20 to 30

Still not visible.

 

Ideas?

 

Edited October 30, 2020 by hollister design Studio