I was struggling for 2 hours (how many times did I write an introduction of my blog like this) with Daz Studio 2.2 trying to figure out why Aiko 4's morph was not working. Result: Aiko 4 got a very tiny eyes, and when I tried to slide the Aiko morph parameter nothing changed except the size of the model's head. That's a very creepy look.
I finally got my answer by reading the Daz 3D forum. Solution: Reinstall Aiko 4, and eveyrthing will be working fine.