From what I have heard on the grape vine through the helicopter community, if you have done you DG Cert with AVCATS after 24 Sep 07, then it is no good (cactus)..A few pi$$sed off operators who have just sent all their pilots their to get re-current and now they have to fork out for it all again.
I would still ring CASA to confirm their approval to teach DG is still current after that date, they may have sorted it out by now for all i know..