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What is this "new featured ruler thing"?

Also, FDSG isn't a valid checksum for any of the recent mainstream patches. KKAD is the correct checksum for 3.1. So, the problem is probably on your end.

Are you on a beta branch? If so, you need to switch back: right-click on the game in steam, properties, betas, NONE.

Are you running mods? If so, disable them.

Perhaps your local files are corrupted? You can verify integrity via steam.
 
This is the featured ruler thing
And as for mods and verication they are deleted and verified.
Screenshot (17).png
 

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Your checksum is wrong. Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK2
- manually delete both the Steam/SteamApps/common/CK2 AND Documents/Paradox/CK2 folders
- re-install game in Steam, run a Steam Verify when done.
- add ck2game.exe to the exceptions list/whitelist of your antivirus app
- start the game with no mods active and test

In particular make sure there are no files or folders left under either the Steam CK2 or Documents CK2 locations, before installing again.