Why did I nearly throw my ibook out the window?

Why did I nearly throw my ibook out the window?

Because of this bug in Flash MX 2004:

The Array class has a serious bug. If one instantiates an Array as a member of a class it is not created as an instance of the class, rather as a static. If you create more than one instance of a class that creates the Array member and push items onto the Array from both instances of the class, they are actually being pushed onto the single static Array

From flash mx 2004 livedocs