Thanks for the report. Can you upload the log files and latest dump from "Documents\Paradox Interactive\Crusader Kings II" if one was generated?
Could you then also try if making a backup of and deleting the "Documents\Paradox Interactive\Crusader Kings II\cache" solves the issue? And if it does upload the a copy of the cache file, and if possible check how much cloud data you are using for CK2 by logging into https://store.steampowered.com/account/remotestorage and look for "Crusader Kings II"
Could you then also try if making a backup of and deleting the "Documents\Paradox Interactive\Crusader Kings II\cache" solves the issue? And if it does upload the a copy of the cache file, and if possible check how much cloud data you are using for CK2 by logging into https://store.steampowered.com/account/remotestorage and look for "Crusader Kings II"