I'm not sure when I'll get to try this on my own Mac, but it gets past that date on my Windows machine perfectly fine.
Do you have access to a PC to try to get past that date yourself?
Do you get an OS X crash report? If so, please post it here between [NOPARSE][#] [/#][/NOPARSE] tags, thanks.
And, it might be worth a full clean reinstall:
- move any valued save games elsewhere
- "delete local content" in Steam-CK2
- manually delete all files and folders left under Steam/CK2 AND Documents/Paradox/CK2
- re-install game in Steam, run a Steam Verify when done.
File Locations on Mac OS X
The executable is in /Users/USER/Library/Application Support/Steam/SteamApps/common/crusader kings ii/ck2.app
On OS X 10.8.x Apple have hidden the /Users/USER/Library/ folder. To see it go to the Finder, hit command-shift-G (ie Go To) and type in ~/Library/ .
The user files (settings.txt, error logs, saved games, gfx) are in /Users/USER/Documents/Paradox Interactive/ .
