Yes, sometimes the ZModeler3 textures have an invalid format that doesn't work with OpenIV for some reason, so try what I said above.
I used a format converter and changed them from DDS to PNG. And still getting this bizarre issue. I don't remember Zmodeler ever asking for so many updates. seemed like every other week or few days, the app was getting an update. I've been using Zmodeler for years and they've changed something, Never had this issue before.
Should I use some other format other than PNG?
Maybe choose something specific?