I have encountered the same Problem on a Macbook Pro Retina with OS X 10.10 Yosemite.
I'm unable to load any saved game.
Even the automatically saved Game doesn't load.
When I try to load a self saved game, the game goes back to the main menu in about 1-2 seconds.
When I try to load the auto saved game the game crashes.
Nonetheless I was able to figure out a (really boring) workaround for the autosave game bug.
When I take the zipped save game file, unpack it, zip it again and put it in the current game location, the save game will be loaded and I can play.
Surely this has to be done every time I wan't to continue my game.
So currently it is no fun playing (
Is there any plan for fixing the load saved game problem in one of the next patches or any not so boring workaround?
Thanks for any helpful answer.