The Alexandria problem is a freeze, not a crash, so it's unrelated. You may have encountered a problem that I've seen earlier, that it crashes when showing something in the city in question. If you try to put a spy into (or close to the city and then double-click the settlement), does it crash then too? It appears to be something to do with the UI showing the city, if it's the same thing.
The script does not boost the AI in the form of faster travel or spawning of stacks (other than Moskon in Iberia and the defender eleutheroi stacks in central Europe). It does however boost the AI's economy, but that shouldn't be related. Possibly it was just hiding in ambush somewhere close.
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