Arrgggg - totally forgot. Playing now.
0a) load customassets-null (ie nothing in customassets), get a hint that talks about flanking and says that all cannons are damaged if a stack is attached by cavalry ... it seems that the hints haven't seen the 3.17 patch
Get a CTD when double clicking the save, but it loads ok from with-in the game.
Try the in-game log and ... its totally fine. I even see the whip-assist message with icons in it.
0b) load customassets-BUD Mod v3.0 Simcutie (ie BUG mod with simcuties extended colors), open the in-game log and ... its totally fine.
0c) notice that I started Civ4 in error logging mod ... need to repeat both of the above ...
0d) repeat 0b) and its ok. Play on but forget to actually save each turn. Duh.
0e) repeat 0a) and its fine when using the original save. Trying my latest save ...
BAM! CTD
Excellent! This is great news. I played my set with simcuties xml file in v3.0 and it caused a crash. Not exactly sure where but I'm going to go back to the beginning save and play just 1 turn and see if that causes a crash.
BTW - in the game, got a GPriest which I settled. Saw some funny reminders, one of which I asked to pop up next turn and noticed this little race ...
round and round they go!