If you save a game and then shut down MTW, then later on load up the save, the game will load up fine, but will crash on the first turn after reloading.
This crash may happen during either the AI moves, or when battle results are automatically calculated, for either naval or land battles.
Saving and reloading work fine as long as you do not exit the game.

I have not experienced any problems like this before, and about all I can think of as the cause would be the new units I added. (I had not added new units in any previous version.)
I added 7 new units to the game, which are used only for Crusades. Their creation and everything else works fine as long as you don't exit the game.
I did not keep the order of the units the same when I appended their names, descriptions, etc. to the various files, so this would be my first thought.
Is there any info available on CTD causes from those of you who have added new units to the game? I have scanned some of the guides here, but they all seem to be on other topics, or else they don't cover things you have to watch out for when adding units.

Any help is appreciated.