A quick google shows that a lot of mac ppl have issues with multiplayer for some reason. Don't know when they'll fix it, but I haven't seen any solid fixes for the issue. And running it in win7 mode didn't seem to help any mac peeps either.
Ya, source code was sweet. Good hitchcock meets sci-fi thriller. Lot of fun. I forgot that the director is David Bowie's son, i love it.