Vray Fur for Grass

[markf]

I'm using vray fur for some grass in scene. The scene is lit by the vray environment and a standard max direct spot using vray shadows.

 

http://www.openrangeimaging.com/Test/grass-shadow.jpg

 

The grass/fur object doesn't seem to receive shadows. In the Max realistic shaded viewport the structure cast a nice shadow on the grass/ground. That doesn't seem to appear in the render. Any help with understanding and fixing this will be much appreciated.