Well, I'm sure Alexsy's very interested in our views about the relative merits of espionage, but that isn't his question! We're no nearer to solving the root problem, which is that he seems to have a defective installation. I doubt if it's a fundamental flaw in the Mac version, as we'd have heard about it before now. So either Alexsy is playing a defective modded scenario, or his software installation is faulty, or he has a corrupted game file.
If this failure is happening in multiple standard random games then I can only suggest reinstalling Civ3, taking care to backup the Saves folder. If it's only happening in one specific random game that maybe that game file is corrupt. If it's only happening in a specific scenario then maybe it's a faulty scenario.