Vertex color bug in 3DS Max

Hi there!

I’m facing a curious bug and i don’t know how to fix it.

  • I have a mdl file of hairs and i want to apply a flex effect.
  • I import the file in 3DS Max with NWMax plugin.
  • I change vertex color to affect the intensity of the effect.
    All the tip of the head in white so the hairs don’t move.
  • Then i export the file, and import it again to check if everything is okay.
    Aaaaand all white vertex turned to black. >_<
    Does anyone faced the same problem? And/or know how to fix it?

Sorry for my poor english, by the way, not my native langage.
And thanks by advance to anyone who can answer this.