I see you've unchecked the one i ment, if that doesn't work then i'm afraid there's nothing else. You could contact MSN/microsoft and make the suggestion to allow buzzes to go through screensavers (not sure if that's possible though)..like an extra option (we don't want that when using another full screen app now do we..could get very annoying). You can leave feedback through the menu: Help > send feedback.
You're welcome