Nothing springs immediately to mind; I don't recall having seen a DOS-level stack overflow report in a long time.
What specific network card is being used in the client? It's possible this could be a driver-related issue of some kind.
Is there any other detail other than "Stack error" printed on the screen? I realise it's awfully difficult to capture that kind of thing, but if there is any more detail printed out one possibility is to get a shot of it with a digital camera so we can have a look.