I've found that it's an issue with V-Ray - most likely in how it manages materials (vs. SU).

I've disabled V-Ray for the time being and things are working fine.

When I try to apply an existing custom material (already in the model) to an object, it often creates a new unwanted copy of that material.

I have tried multiple approaches (applying to a material-less object, applying to a group or single object, etc.) to no avail. The error also occurs in various models, but always an existing file and not a new model.

The only thing I have found that works is to rename the existing material, then paint the object - which is obviously not an optimum way to work.

Thanks!

MacOS 10.14
SU 2018 Pro (this error has happened in multiple versions)

I have successfully converted image files to material files .SKM in the past, but honestly can't remember how I did it...

It was most likely via an Extension or Ruby console, but my searched have come up empty.

Does anyone know how?

MacOS 10.14
SU 2018

Thanks!