The community has been grappling with this problem when using high-content modifications - primarily Warfare Expanded: Reloaded (WE:R) mod (which adds a huge amount of assets and CV) in combination with mods like Urban Complexity (UC) or City Styles (CS). Users have also reported problems on larger maps, or using mods which add natural wonders. Mid and late game instability has also been reported using WE:R even alone. (this could be related to an issue reported here ) The problem was first reported around the first week of October 2020, which places it right after the 24 Sept update of the game. People have reported it no matter whether they have NFP or not. Please refer to below image for reference. The intensity varies. No specific units seem to be impacted. It is random. Sometimes in a mild manifestation of the glitch, just assets or models are missing. We have identified a specific error report appearing in the Renderer logs: [2021-02-18 11:10:36] Error: ResourceList.AddResource(), attempting to add more than 8192 items. or [2021-02-18 10:10:10] Error: ResourceList.AddResource(), attempting to add more than 16384 items. [2021-02-18 10:10:11] Error: ResourceList.AddResource(), attempting to add more than 16384 items. [2021-02-18 10:10:15] Error: ResourceList.AddResource(), attempting to add more than 16384 items. [2021-02-18 10:10:27] Growing UpdateSubresource invocations [2021-02-18 10:11:21] Error: ResourceList.AddResource(), attempting to add more than 16384 items. and combinations of these. This appears already from turn one, when using WE:R and UC or CS. WE:R alone does not cause this in the log at start. Details of the mods: WE:R: https://steamcommunity.com/sharedfiles/filedetails/?id=2044522714 CS: https://steamcommunity.com/sharedfiles/filedetails/?id=2169097417&searchtext=city+styles UC: https://steamcommunity.com/workshop/filedetails/?id=1677748412 By far, it seems the elephant in the room is WE:R. We tried splitting BLPs into separate smaller packages not to create an enormous BLP file. But this did not alleviate the issue. To summarise: - The game engine seems to struggle adding new art when the amount of items is very high. - Modding fixes alone do not seem to remove the issue. - Quite possible there was some limitation introduced in Sept 2020 that triggered the issues. - Breaking WE:R leaves the developing team with two years of effort wasted. The mod is used by thousands on Steam. Logs and dumps attached. We are aware that this does not seem to be a problem for the basegame, but reporting it to Firaxis is the only way we could still save this modding experience loved by so many. Thank you. I remain available to answer more questions.