I've just bought the Australian retail version of the game (version 1.0.190), and it works just fine.

However, when I apply Australian patch 1.2.204 to the game I'm experiencing all kinds of problems - I don't get any score for beating scenarios except the first (Ambush), the "Beachhead" scenario locks up while loading (one light from the end), and after a couple of moves into the "Border Conflict" scenario I get told the scenario "is broken" and I should reload it!

I uninstalled the game, started again - sure enough, the retail version works perfectly, but as soon as I instal the patch I get the same problems. This is definitely the Australian version (it has the Red Ant logo) and the Australian patch.

Does this sound familiar, or am I doing something wrong?

Once again you posted on the wrong board. This is Massive Assault Network, scroll down a bit more for Massive Assault.