As was mentioned a few weeks back there is a problem in full screen where when you finish a game, you just get a picture of Mars, no buttons, and no escape, I had to reboot my computer.
Chastened I played in a maxed window. Having built the Engineering centre, and the off world market i found that when I opened them they wouldn't open.
i think it opened then shut immediately, or didn't open for the market. This seemed to work on the full screen game, but not for a maximised window.
i'm playing on a 2010 MBP i7 with 8Gb, the game seems a bit sluggish, my machine should be upto the task shouldn't it.
lots of good touches reminds a bit of a more sophisticated M.U.L.E.
geoff