wierd 3ds max 6 rskin bits streach across map problem

[darkrider]

as the name suggests all or some of the bits of my model that are using the rskinbumpcolourise.fx shader are streached across the map to the bottom left corner and no matter how the dude moves (its a land unit) they stay stretched to the same place the bits of the model that are using the normal meshbumpcolourise.fx shader are fine.

 

has anyone ever heard of this problem before or know what may help?