Looks like you've stumbled on one of the many, many problems that occurs when using global variables. Since these variables do not need to be declared, it's relatively easy to misuse them. I don't think it's possible to tell, from the information you've listed, exactly what the problem is, but here are some guesses:

• autouse eliminates a lot of compile time checking and can break things if there is code that needs to be initialized when the program starts. Check to see if the modules are initializing any variables. If the modules in question initialize things only when autoused (in other words, when you first use them, not when the program starts), perhaps they're overwriting the globals?
• The way you initialize globals has me concerned:

  $QteExpires = '30 days';
  [download]

  Since you have not explicitly stated a package name, this implies that you have not used strict. This means that your error could be virtually anywhere. All bets are off, then.
• In EmailQuote, have you fully qualified $QtePostscript (i.e., referred to it as $main::QtePostscript)? If not, you may be referring to the wrong package instance of it, depending upon how it was used.
• Why not eliminate globals and simply pass the data? Better yet, create an object that carries the data with it and pass the object?

As a general rule, if I find that I'm worrying a lot about namespace issues, then I have some serious code problems and need to consider redesigning things, though I realize that you may not have this luxury. Good luck! Sounds like you've got a serious problem on your hands.

Cheers,
Ovid

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