How to fix black emissive light mtl from vray lightmtl?

Hi! I need some help please,

For some reason the meshes that have emissive light material, are now totaly black.
The emissive material comes from a vray light material exported with datasmith in 3dsmax.

In the edit windows it seams ok, but in the play or the main window it appears black. I already tried to change the light map coord to 1 and it doesn’t do anything…

Somebody help me with this please because I’m getting crazy!