The world of national distributor groups often resembles the ever-shifting sands of the desert – members change, vendors change, and its relative market position often changes. So it is a radically changed world in which the Digital Delivery Group (DDG) finds itself in the wake of last week’s announcement of the formation of a new national distributor group – Catalyst AV – an announcement that prominently featured the names of four DDG distributors who apparently defected to the new competitor.