Alpaca
True it might be a size thing causing the error through pathing but as the remainder was sea I'm not so sure. I don't know whether there is something tied to missions or one of the random 'comparison' events (ie you're the biggest, richest etc type things) that may cause it as there's only one province one faction to compare. However I've had similar random crashes where I have a big map and several factions so not sure.

Spent some time this afternoon trying to work out where it was happening and all I could get to is that it seemed to occur regularly between the top and bottom of these log issues. The last definite line to appear was the top one and the only guaranteed line if it didn't crash was the last one - the others being tied to events etc).

19:04:46.671 [system.io] [info] open: found data/ui/northern_european/eventpics/end_of_turn.tga (from: I:\Medieval II Total War unofficial 1.2)
[19:04:46.671 [game.script.trigger] [trace] Trigger <0578_Unexplored_Army_Fleet_Idle_Trigger> fired
19:04:46.671 [system.io] [trace] file open,,data/ui/southern_european/portraits/portraits/old/generals/000.tga,26540
19:04:46.671 [system.io] [info] open: found data/ui/southern_european/portraits/portraits/old/generals/000.tga (from: I:\Medieval II Total War unofficial 1.2)
19:04:46.671 [game.script.trigger] [trace] Trigger <0006_UI_Panel_Settlement_Icons_Trigger> fired
19:04:46.671 [game.script.trigger] [trace] Trigger <0046_P_Normalise> fired

We're now trying to set up some scenario's to test on a smaller map which may point to either pathing or memory. Although even in Vanilla I used to get odd crashes early on so I don't know whether there's still a bit of a bug problem... I'm pretty much out of ideas on this one.