Try a full clean reinstall:
If this is Steam: move any valued save games elsewhere and uninstall the game from within Steam. Then manually delete ALL the CK2 directories from under BOTH the Steam and MyDocuments folders. Now reinstall the game from Steam, and run the Verify just to make sure it all came down properly.
If GamersGate: Move valued save games elsewhere, and uninstall the game. Manually delete the CK2 directories from where GG put them and from MyDocuments. Reinstall the game , download 1.092 patch again and apply it.