The pz3 I saved looks fine, and so do various other pz3s I saved with Xie in them.

DAZ said the IB update made the maps compatible with Aiko, and I thought that meant only the textures/MATs changed. But I can't figure out what else could be causing this.

I think you only need to download the file on the "product updates" page to update the IB pack for Poser. It's only 3 Mb. You only have to download all those files that appeared on your account page if you want the D|S files. At least, that's what the e-mail they sent out said.