Problem with hair opacity

[Schnyder]

Hello, I would like to claim for your guys help as I would not be able to solve this. I'm importing a character from the daz3d studio and I can't get the hair to look properly. It's a complex hair and works with diffuse and opacity map. Some parts of the hair work good, but others, remains with a black mesh at it and loses its transparency. This happens too if i change the material to plastic or other transparent material.

Would anyone help me to solve this?