Re: CC showing up in CAS but not in Game
@jinjuginger Thank you 🙂 You've got a Sim named Carson Cortez who is trying to use a base-game sofa but unable to do so (this was the reason the MCCC last exception was generated). That might just be because he can't get to it. But it also might be an indication that you have broken build-mode items somewhere.
The CAS CC issue you describe just sounds like Sims got saved with CC disabled at some point.
You've got some duplicate files listed in the MCCC list of mods; they're noted in red there to help you find them and delete a file. A lot of that is build/buy. Delete those, then try a 50-50 test of your build-buy CC. Drag the whole Mods folder out, let the game create a new one, and add half the build-buy CC (and no CAS CC) to test it. Full instructions are here: https://answers.ea.com/t5/Mod-CC-Issues/INFO-How-to-Use-Mods-and-CC/m-p/13439356#FiftyFifty