• We have updated our Community Code of Conduct. Please read through the new rules for the forum that are an integral part of Paradox Interactive’s User Agreement.
Some more details would be helpful. Assuming you are using Steam, right click the game in your steam library, click peoperties, go to local files, then verify integrity of game files. This will make steam repair any broken files in the install. It will also revert any intentional changes you have done to the game files.

If that doesn't work, at what stage is it crashing? Are you using the launcher? Are you clicking resume or play in the launcher?
 
Have you just gotten the game? How old is the Mac and what's it's model number? Are any other games doing the same thing? Did you buy the game from Steam directly?

Like Brynjar said we need more information
 
Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-EU4
- manually delete both the Steam/SteamApps/common/EU4 AND Documents/Paradox Interactive/EU4 folders
- re-install game in Steam, run a Steam Verify when done.
- start the game with no mods active and test

In particular make sure there are no files or folders left under either the Steam EU4 or Documents EU4 locations, before installing again.

**File Locations on Mac OS X**
The executable and DLC folder are in Users/USER/Library/Application Support/Steam/SteamApps/common/Europa Universalis IV/
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, mods) are in /Users/USER/Documents/Paradox Interactive/Europa Universalis IV/ .


IF that doesn't help:
Please attach here your Documents/Paradox Interactive/EU4/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/EU4/logs/ folder, attach here system.log , error.log , exceptions.log

Also in Steam please click on Steam-Help-System Info, and paste everything there into a text file and attach that here.