I have the same problem. I wanted to convert some V4 characters onto Genesis with GenX, twice I had a success, BUT the other characters don’t want to load on V4. Everything is the same as topicstarter told. I have no duplicates of V4 installation. Very strange that two characters apply correctly and other don’t. I don’t understand when something doesn’t work for a half, it has to or work absolutely or absolutely break.
Also, where can I find this Power Loader? There’s no such thing in the Daz Store or anywhere in the internets.