I am having difficulty creating new units from copies of existing ones. I realize that copying and pasting units screws up the map, but when I create a new unit and push the "copy from" button, I can't even get that to work right even without altering the new unit further. They won't show up in the editor, and when i test the map, they come out looking like that cursed white dome. Please can someone tell me how to get around this?