LDialogBox DoDialog cra****ng when runnimg in X.5 Leopard / Rosetta, someone experiencing similar behavior?

Hello!

I have some Code compiled under 10.4 / PPC with MW's CodeWarrior.
However when running under 10.5 in PPC Mode I am experiencing repeatable
crashes in LDialogBox 's DoDialog().


Is this a known bug in PP or is it definately not PP 

Boolean
CNewJobWindow::DoShowFailure ()
{
        Select ();
        BringToForeground ();

        StopProgress ();

        MessageT        theResult;

        StDialogHandler theDialogHandler (XRayClientApp::MapResID
(rPPob_FailureDialog, ResType_PPob),LCommander::GetTopCommander ());

        LDialogBox*     theDialog =
(LDialogBox*)theDialogHandler.GetDialog ();
        if (theDialog)
        {
                LStr255 theMessage;
                theDialog->GetDescriptorForPaneID (kAlert_Text,
theMessage);
                theMessage.Replace (theMessage.Find ("\p^0"), 2,
mDescription);
                theDialog->SetDescriptorForPaneID (kAlert_Text,
theMessage);
                theDialog->Show ();




// This code here crashes deep inside PowerPlant for unknown reason, but
only on Dual 2 Core CPUs:

    while (true)
    {
        //MessageT      theMessage = theDialogHandler.DoDialog ();
        theResult = theDialogHandler.DoDialog ();
        if (theResult == msg_OK)
        return true;
        else if (theResult == msg_Cancel)
        return false;
        }
    }

return false;
}