I'm creating a maggot prop (which just creeps me out, but it was a request).  

When I have the maggot at 100% (the size it comes in from Cinema 4D as, which is about as tall as M4) everything is fine.

When it shrink it to its final size of 2%, and use any lights with Depth Map Shadows, I get a square block for a shadow.  Ray traced shadows are ok.

Is this an issue for any tiny prop and Depth Map Shadows?  should I just put big warnings on it that you can't use it with Depth Map Shadows without bad results?  Or is there anything I can do in the material nodes to avoid this?

Thanks so much for the help. :)