Saving/loading is pretty common in flash, but a lot of people don't realize that saving/loading arrays is a different process. For example, try running the code below (make sure your flash file is called "Untitled-1")...

//////////////// cant use code tags on userpages :( //////////////////////////////////////
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// create save data object
var saveData:SharedObject = SharedObject.getLocal ("Untitled-1.swf");

var player_inventory:Array = new Array ("hat", "sword", "gun"); // create new array

_root.saveData.data.player_inventory = _root.player_inventory; // store inventory in saved data

_root.player_inventory [0] = ["dog"]; // change original inventory array

trace (_root.saveData.data.player_inventory)
; // returns dog instead of hat for first item, even though I didn't change the saved data!
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As you can see, the code returns dog as the first element of the array, when it should return hat. The first element was changed to dog AFTER it was saved, yet the save data still says dog.

To learn how to fix this, CHECK OUT MY SAVE/LOAD TUTORIAL!