Hi,

First of all sorry for the late reply. Looking at the code I see some things that may cause it (I did not try it):

1) The file does not have a name. That may not cause problems in itself but can cause problems in the future. Looking at Adobe docs:

var prefsFile:File = File.applicationStorageDirectory;
prefsFile = prefsFile.resolvePath("preferences.xml");

You can pass null to the File constructor but then assign File.desktopDirectory (or other value) to the File object.

So either:

var file:File = new File("app-storage:/preferences.xml")

or

var file:File = File.applicationStorageDirectory.resolvePath("preferences.xml");

[taken from Help:File]

2) the garbage collector shoud not cause problems (if you have a reference to the object then it will not be garbage collected)

3) I remember I had some problems with ObjectUtil.compare at some point (2 identical objects were reported as not identical). I think it was due to the complex nature of the objects. I solved it by creating my own compare function:

if obj1.len == obj21.len
    for i=0,obj1.len i++
        if obj1[i] != obj2[i]
            ret false
        ret true
    ret false