Qantas seem to be having program tweaks all over the place. Here's another
Important information about Qantas Lounge access. From 1 February 2011, Platinum members must be travelling onward that day on a flight with a Qantas, Jetstar or oneworld flight number on your ticket to access Qantas Domestic or International lounge.
http://www.qantas.com.au/fflyer/dyn/...-more-benefits