HeroOfDestiny, I wrote the hero's scripted name in the scripts without parentheses. And for some reason, I added a command to the hero block for controlling the AI in the combat script. It won't work there.
Correct the line in the script to EnableHeroAI( "Ingvar", nil ) and remove it from the combat script altogether.
Oh, these scripts... I missed a sign, and the game immediately complains.
But as always, thank you!