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On the second Mac, I go into Multiplayer -> LAN -> Join Game, and the game from the first Mac correctly shows up:
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On the first Mac, I create a LAN game (just single default race) - all seems fine, the "Start Race" is disabled, which I assume stays disabled until another player has joined. I have 2 Macs, no firewall, they can see each other on the LAN and both of them have Flatout 2 installed (got it from the App Store last week).
