There won't be a fix from the developers for your individual problem unless it turns out to be a game bug. But as the game has not changed since June last year, that seems very unlikely to be the issue here.
That error log shows some issues that should be fixed in 1.4.4 , so let's do a clean reinstall:
- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox Interactive/CK3 folders
In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.
- re-install game in Steam, run a Steam Verify when done.
- add CK3.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test with a new campaign - NOT with any ex...
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