Actually the mod or CC is the broken thing - because when the content used to make the CC or mod getts improved or fixed that changed content is no longer in the game as the game overwrites or removes that info s the CC and mod creators have to remake their content off the new version other wise the AI etc cannot find what that was . It is why I never use CC or mods in a developing game as it is ever changing as long as the game gets new content. Lucky for players many creators though can rewrite their content be on the same game level as the game once the user remove the content and redownload the new stuff.
I never like doing all that and just rather play with just Maxis content so my game does not get "broken" as when it gets fixed by Maxis as user content cannot be changed by what Maxis does to fix the game on purpose so Maxis cannot remove the players content - that is up to the player.
