I'm trying to render a scene with maya hair, using mental ray with final gathering and mental ray in-build function to create a physical sun/sky. But the hair gets some really werid results, no where near even a bad result (worse than bad), have no idea how to fix it!! Its gets all white and black no between colours. I thought the contrast was to high,but no. It is an issue that happens only with FG turned on.

Anyone knows a good solution for this?????
Or there is no solution, searched at google but couldn't come across a way to solve.

Thx!!!