The actual patch (1.29) is highly recommended, epecially if you have the
1.07-version (version number is stated on the "starting screen", i.e. where you choose to start a new game; IIRC it's in the bottom left corner of the screen). Upgrading right now might cripple your game, the version confusion might explain the load errors (although I once succeded loading a pre-patched game
). So could tell your version number? And it's
not a modded game?
Also, I don't know if mac-save-files are compatible.
Maybe you could just post a screenie, preferably showing that strange Zulu unit?
Any other screenie might help, too, to see if the game is eventually modded.
To take a screenie, hit "print screen" key, exit game or toggle directly to "Paint", choose "paste" and save the stuff.
For your nuke problem: look at a city screen (captital might be best); if there's alu and uranium in the strat resource box (upper left corner)
and Manhattan Project is built yet, you can produce nukes (assuming you got all techs - but "future tech" sounds like) in that city. F7 screen will show if Manhattan Project is already built.
edit: you can build Manhattan P. on your own in a city that has just acces to uranium.
I *think* you use a mod. If so, you may ask in the related forum thread (if there is one, that is).