disregaurd I posted after you already solved it...moderators, please del this post.

these are modeled shadows, correct?
if so,

1)are they passable? //make sure they are.
2)are they created at runtime? //set them passable in their action or function.
3)are you using a trace to set the position? //check to see if the trace is hitting anything, also double check the trace modes.

simpler is better, I would set skills up on each model to place it's corresponding shadow, based on it's position. I would also set them to be created dynamically through script. If you have already tried this then you may need to through and manually place them.