hey nathan
movieclipsprite will only rescale the object if rescale is set to true (default is false)
as far as positioning goes, the reference point used is calulated from the actual reference point of the clip plus half the width and the height. This means that if your content within the movieclip is not aligned top-left (ie. with it's top edge at 0 y and it's left edge at 0 x) there will be some problems getting it to center.
if you're still having problems, why not send over a sample of the movieclip you're trying to use?
atb
Rob
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Rob Bateman
Flash Development & Consultancy
rob.b...@gmail.comwww.infiniteturtles.co.uk
www.away3d.com