Volumetric lights not rendering

[medicalart]

These lights have been rendering fine all day until now. They are volumetric point lights that show up in VIPER but not from a camera render.
Yes, the render globals panel has "volumetric lights" enabled. No objects are blocking the lights.
Every other object in the scene renders properly, but not these lights. I tried inserting a new vol light and even that renders properly.

Any thoughts as to why they don't show up? Thanks.

[medicalart]

Repositioned the lights and they are working. I must have had something blocking them. I guess it doesn't take much to block a point light source even if the visilbe light has a large radius...

[Jim M]

It is a 'point' light after all :)

[medicalart]

I shall call them "pint" lights because when they don't render you need a pint of lager to figure out what's wrong.