I have tried it on two different computers. Ones a Mac OSx 10.4.11 and ones a 10.5, respectively. The first one works rather well, except the Campaign mode is prone to unexpectedly (though it's getting rather expectable now) close and there is no longer rollover help on items or nation info on the quick battle page. The second computer doesn't quit the Campaign mode, but during battles, the ground cut throughs the graphics that should be there, so you can only see little bits of the units or the scoreboard. Buildings are fine, but everything else is affected. Haven't yet seen how it affects water. Any help?