[JS, CS4] file.Copy() results in 0 KB file

Question

Hello,
In a nutshell, a script goes through some links, copies the link to a given destination, checks if there's a corresponding .CDR and then copies that to the same destination. It works absolutely perfectly, except for a seemingly random link - when the linked file and CDR are copied, 0 KB copies are created in the destination folder
This is a snippet of the code, for copying the link (the CDR copy bit is basically the same, just with a bit of string work to get the correct extension):
function normalLinkCopier(myLinks){
for (i = 0; i < myLinks.length; i++) {
  var myLink = myLinks[i];
  // Capture the location of the linked file.
  var myLinkFile = new File(myLink.filePath);
  // Capture the destination of the copied link - uses the folder selected previously and the link's name.
  var myNewLinkFile = new File(myFolder + "/" + myLink.name);
//~   alert ("Original: " + myLinkFile + myLink.size + "\n\nCopy :" + myNewLinkFile)
// Copy the linked file to the destination
  myLinkFile.copy(myNewLinkFile);
The alert tells me the correct path and name of the original file (myLinkFile), and the correct path and name of the destination file (myNewLinkFile). The original file exists and it has a size > 0 KB. However, when the copy function runs, it somehow makes the copy 0 KB.
One time when I was trying it I received this error message:
IOError: Cannot find the folder "C:\Program Files\Adobe\Adobe InDesign CS4\Scripts\XHTML For Digital Editions\null\<the erroneous file's name was here>.eps
I have not been able to replicate the above error, however.
To add to the weirdness, when I delete the link that is causing problems, the problem switches to another seemingly random link (it was links[33] originally, then it switches to links[0]). Delete that, then it switches again...but it's only ever a problem for one link at a time.
I cannot see what changes between getting the link's path and copying it - and why it only happens on one random link at a time.
If anyone can shed any light on the situation I will be extremely grateful!

Answer 1

I tried putting the loop contents inside a function, then I tried putting the new File lines inside separate functions, but all to no avail. Thanks for the idea though.
I've discovered something else about this error though. For two links in the document, A and B:
Select A, run the script, it works fine.
Select B, run the script, it creates the 0 KB files.
Select A again, run the script and 0 KB files are created.
Although I don't know if that opens up any avenues for me to explore...