I have the same trouble as Stephanie.
Kimmie, are you suggesting that the foil follows the crust as it shrinks or should the crust not shrink at all?
Wendy, is there a "trick" to making a shortbread crust that prevents it from shrinking (other than not greasing the pan)? I don't grease my pan because there is enough butter in the crust already but it still shrinks.
Jock