Black renders on Billboarded trees

[SC5342]

Hi, I'm using FP7 with Arnold.  New to Forest Pack (somewhat new to Max - I'm a longtime Modo user).  I'm building some background billboard trees and - see attached - I'm getting some weird black non-transparency when the trees are scattered via a spline.

I ran test renders, and when they're not scattered inside FP7, I can stack them 4 deep and I get none of these black render issues.  This only happens when they're scattered inside FP7.

Any advice?  Thanks.

[Rokas]

Hi.
Try increasing Transparency Depth parameter:

[SC5342]

That was it!  Thanks Rokas