ActionScript 3.0 :: Arrays - Cannot Get Shared Objects To Work

I am trying to make a to-do list application. I would like it to save each time I close. So I researched shared objects, and somehow cannot get it to work. I hold all my "items" in an array, then copy that array to a shared object. Here is the code used to copy the array: At the top. I put the array in a Global class, just ignore the GlobalVars.vars. junk. It's not really necessary, but it definitely works everywhere. ListItem is a class I made that works fine by itself.

Code:
var listCookie:SharedObject;
listCookie=SharedObject.getLocal("lkjasdf");
if(!listCookie.data.itemArray) {
listCookie.data.itemArray=new Array();
} for(var i in listCookie.data.itemArray)
[Code] .....

When this function is called, it equates the two arrays fine. I trace them both afterwards, and they have the same items in there. But when I close the .swf and reopen it, the saved array is full of undefined references. It has the same length, just nullifies everything it was supposed to have.