I'm trying to use SharedGroup with a modified SceneGraph I had ealier.
I created a Link and a SharedGroup node.
It compiles fine, but each time I run it I get the following message:
java.lang.NullPointerException
        at 
javax.media.j3d.CollisionThread.updateCollidableObjects(Compiled Code
)
Exception occurred during Behavior execution:
java.lang.NullPointerException
<snip>

Does anyone know what is happening?
I set ENABLE_COLLISION_REPORTING on both the SharedGroup and the Link 
'cos I thought that was the problem...

Thanks,

Chris.
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