MacOS 10.12.6, 27in retina iMac.
I have only one saved campaign and I don’t remember where I was parked when I last exited the game. Anyway, when I try to resume that campaign, OiS stops responding. The wedge cursor is frozen over the “Continue” button where I clicked. I have to Force-Quit OiS. I can’t find where that leaves any kind of crash report.
If I instead click on 2: unused I can begin a new campaign with the tutorial.
Is there a file somewhere that represents this saved campaign, that I could send you? I looked in /Applications/Steam.app/Contents and don’t see anything likely.