Show the contents of the die() function, please? Nothing you have there is going to be of much help.
One thing that might make a difference (though I doubt it) is that your color value is RBG instead of ARGB. You could try
0xff800080 instead of
0x800080. It shouldn’t make a difference to Flashpunk, but it’s possible Stage3dPunk doesn’t account for it at some point.