Think it has to do with this GPU limitation:
- NURBS: NURBS-only objects will be ignored in GPU mode. Objects that have both triangles and NURBS data, will be shown as triangles.
Not sure if actually is something wrong else I would just click the error away.
If you’re seeing that warning you may have scene nodes checked as “Always Render NURBS”. If you import NURBS and plan on using GPU mode, a best practice would be to select the parent node, go to the properties under the scene tree, and scroll down to uncheck the NURBS option previously mentioned.
Note, Rhino .3DM files will only import NURBS because there isn’t a tessellation import option. In that case, you must select the parent Node and use the Re-tesselate under the properties.
If you ever notice Geometry disappear check if the geo is NURBS and re-tessellate and then it will be visible.