I'm building an age in URU with blender 2.46 and gow-pyprp 1.5.0.
I have problems with the stencil functionality.
When I use a blend as stencil it works. But when I use an grey image the stencil work in blender but not in URU.
Is this not yet supported in pyprp or did I make an error?
Here are some screenshots
The render in Blender:

The render in URU:

And the config in Blender for the stencil:

As you see in blender there are pebbles only near the edges. In Uru the pebbles cover all

Does someone have an idea what is going wrong?

Thanks
Alex