Ok well I haven't changed anything in that file. I only have the 3 roman factions, gaul and britons playable, but as I only want 2 roman factions that shouldn't matter should it? I have made the change to the Total War\data\export_descr_advice.txt file and used the script generator to create the file shown a few posts back. Like I said, it works fine going from the first faction to the second but then closes down loading up the first faction again.
I have narrowed it down to when it wants to load. For every turn except the first when you load, by either using ctrl-L or by selecting quick load from the menu, the game shuts down. You can open it up again and open up the quick save and it will be on the next faction and everything would be fine, until you try to load the next faction again. This is playing Hot-seat btw.