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Beta testers of Rayscaper
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Did you restart SketchUp? Did you install Libfredo?
@ntxdave - In your test file, it had a ton of geometry generated in the model. If I tried to re-create your scene again, step-by-step I got this:

Can you try to just generate the grass on the plane, a first step and see if that works?
As a sanity check, you are using Rayscaper 0.9.72?
@Krass I didn't modify the materials, just used them as they came from SketchUp. But it's possible ofcourse:

But maybe it's more intuitive to use the alpha channel from the color slot immediately if one exists?
That's impressive as a native only approach.
And here are some teapots in the night 

Here's a quick video on how to use Rayscaper with Skatter. Still trying to get better at making video content 
@ntxdave Sorry about that, this seems like a real bug. I will investigate!