CTD in year 157 BC

I'm playing the Romans' campaign and I'm in the winter of 157 BC. As soon as I hit end turn, one of my characters finishes his move (walks a few steps on the map, as I have ordered it previously), then the active faction changes to Saka Rauka and the game CTDs. I can send you my savegame from the winter of 157 BC, because the forum won't allow me to attach it (filesize is 4,5 mb, the forum limit is 1.9mb). I have savegame backups of the last 12 game turns. I tried loading up from the winter of the previous year, 158, but the game inevitably CTDs again when I reach the winter of 157 BC. Check out my savegame and give some ideas pls. :)

Have you tried the suggestions from this helpfull thread?

The section: "The game crashes as soon as I end turn / The game crashes during the AI turn." woud apply here, no?
The first thing I'd check for is Saka-owned revolting cities.

Edit: 'revolting cities'? Huh... I'm just going to leave that in there.

Thanks, Raygereio. Actually I circumvented the problem later last night, by loading the game 3 turns earlier and giving about 100 000 mani to the Saka in every turn. The CTD didn't repeat.
Still that thread is really helpful and I'm sorry I haven't found it earlier. The detailed explanation on how to take control of an AI faction is very valuable :)