Solved!
I already had the new version installed, but I hadn't thought of replacing the controller. I did (and set the option back to how they were previously -- at least as far as I can tell), and suddenly other kinds of customers started showing up.
Notovny: I wanted to check the setting of the "Maven" option before doing this, but then I forgot. So I don't know if what fixed it was simply changing the controller, or setting the Maven option correctly. I'm a bit annoyed at having failed at basic experimental science like this, but the important thing is that it's now fixed
Thanks all!