I had the problem with the 1.0 game for Carthage that I continued in 1.5, and I as Carthage owned the city of Carthage. But I crashed in 237BC all the same.
I tried a Brutii game starting in 1.5 and did not have the 237BC crash even though I as Brutii owned Carthage (and Numidia owned it before me, somehow).
So the Carthage not owned by Carthage theory doesn't hold any water but I have no idea what is causing this. I was certainly relieved, however, that I was able to get to 236 BC in my Brutii game.
I should add that I also have BI patched to 1.6 but am using no mods of any kind.
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