Thanks, Jerome. This makes sense of it. It also explains why the game was so much faster loading after the patch. Unfortunately, I've had to fix the horse archer/chariot/camels with the thrown attribute so they skirmish, and the Egyptian oversize units (and shield), and give the slingers a bit of range. And now it seems to be longer loading again.

Now to see if I can get those pesky elephants firing again. Right now they fire once on the move and then just stop firing.