First of all, thanks for PIE, its an amazing tool.
I've run into a problem where I have a DIV with the PIE behavior and an initial Width: 0%. I then incremement the width up 1% at a time until the desired new width, in this case 25%. PIE does fine with all this and renders the corners appropriately. However, when I 'close' the DIV and decrement the width value down to 0%, the DIV is still showing at the end due to the rounded corners. The width shows to be 0% but it is not hidden.