in reply to loss of dll in a multi threaded app

Try adding strict and warnings to your script and I think (but can't test as I don't have the requisite module) that this line 

    $cxnid = Win32::RASE::RasDial("UE01", undef, "jwetherill", "abc123
+", undef, undef);

[download]

will issue an error: "Invalid value for shared scalar at ... ";

The problem is that you are trying to share objects (blessed references) across threads, and that is not allowed.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
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