OSA and grass problem

hello.
While making my scan, I found a little problem that only happens when I have osa turned on. The problem is the little black lines on the bottom of the render, help would be appreciated and thanked.

P.S. i know the scan looks crappy but it’s still under construction!

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I don’t have a solution for you, but here is another (unsolved) recent thread with what seems to be the same problem - maybe you can help each other with that one…?

“Rendering Grass: Black Stripes” http://blenderartists.org/forum/showthread.php?t=109894

The first thread I ever posted here was the same problem:

http://blenderartists.org/forum/showthread.php?t=68874

Apparently it has something to do with the particles intersecting with something…