OK then, let's do a full reinstall with Steam refresh.
- move any valued save games elsewhere
- "delete local content" in Steam-CK2
- exit Steam
- manually delete all files and folders left under Steam/CK2 AND Documents/Paradox/CK2
- manually delete everything in the Steam folder EXCEPT steam.exe and the /SteamApps/ folder (note this may lose user settings in some games)
- manually run steam.exe to rebuild everything
- now opt into 2.2.1.1 beta
- re-install game in Steam, run a Steam Verify when done.