Poor Australians. Not only do they live in a land purpose-built to murder them, they still struggle with video game censorship--even after adding an adults-only rating. Volition's open-world murder simulator Saints Row IV has finally jumped through enough hoops to be approved for an Australian release, but the changes mean they won't be able to play co-op with people in other regions.
The Australian classification board had taken issue with the 'Rectifier' alien anal probe weapon which blasted people into the air, and a side-mission where players took alien drugs to gain superpowers. While the anal probe was later approved, suggesting that any sort of narcotics may be good for you was a sticking point, so that mission was pulled from the Australian release.
While the game is coming out down under after all, it'll be missing that twenty minutes. Which is enough of a change to make the Australian version "incompatible with [other] versions in co-op."
A statement on the official Facebook page, since removed but preserved for posterity by Kotaku Australia, said, "While we are very proud of all our different missions, we do feel that Saints Row IV on the whole remains largely the same without this single optional mission, and we also feel that you deserve to know what you are getting in Australia."
Sorry, Australians. You'll be stuck to anal-probing with your countryfolk, not high on alien drugs.