Have only being using Forrest Lite for a short time, and could not find the answer on your forum or the grass tutorial. Attached is just the elements I'm having problems with, it is part of a much larger arch viz file that is 21MB.
As per the iToo tutorial, I followed the princples for making a lawn by first making 3 blades of grass (simple polys), then making them into a Forrest clump that was contained in a small circle. From here I tried to make a larger lawn area using this 'clump' as the object and a large circle as the new area. Unfortunately when rendering, it simply comes up blank. I'm using 3DS 2012 Student and mental ray and OpenGL driver. Other areas I've created with the free bush and maple tree, work and render fine. Hoping it is just a simple setting. I cannot even get proxies when adjusting the units density in the distribution map, yet when I did the iToo tutorial on grass, had not problems at all.
Thanks in advance.