[2021] Game crashing on the game initialization screen or main screen

What antivirus app do you use?

DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach your Documents/Paradox/CK3/pdx_settings.txt .
From your Documents/Paradox/CK3/logs/ folder, attach system.log , error.log  

What antivirus app do you use?

But that error log is pretty concerning. Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox/CK3 folders
- 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, BEFORE restoring the saved games

In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.  

z111unter said: Tried clean reinstall, same thing,

Then you must have a different problem cause than the OP, as that fixed them up. In future please make your own new thread, thanks.

Yours looks like an nVidia problem, driver or card:

Stack Trace:
1 nvwgf2umx.dll cask::ShaderList::availableShaders (+ 1783114)
2 nvwgf2umx.dll cask::ShaderList::availableShaders (+ 1746215)
3 nvwgf2umx.dll cask::ShaderList::availableShaders (+ 1890105)
4 nvwgf2umx.dll cask::ShaderList::availableShaders (+ 162109)
5 nvwgf2umx.dll NVENCODEAPI_Thunk (+ 1041785)
6 nvwgf2umx.dll NVENCODEAPI_Thunk (+ 1041154)
7 nvwgf2umx.dll NVENCODEAPI_Thunk (+ 2587372)
8 nvwgf2umx.dll OpenAdapter12 (+ 4184308)

Please try this:

- uninstall the nVidia driver and all other nVidia software
- reboot
- install the latest by fresh download from here:
Download Drivers | NVIDIA - reboot again

Good luck with that!  

Please attach new copies of all those files, thanks.