Our trial-and-error method of using Associative Hide has become muddled by ACADM's sudden inability to provide us with accurate previews. Even on the simplest of situations, you pick the foreground, pick the background, and watch as nothing changes. Play with the various settings until frustration gets the better of you, hit "ok", and then watch the hidden lines magically appear. Probably not where you wanted them, but at least some are there. Although editing the hide situation is made even more difficult as the preview doesn't show you what you're going to get anyway. At least not always.