I tried to add in a new leader for a civ. All I did was I copied the format for an old leader, and changed all the values like the tutorial said. I would understand what went wrong if it said that only that leader wouldn't work, but I can't find the problem as it disables all of them. The only thing I can think of is that before all of that, it says that the </CIV4CivilizationsInfos> or something like that tag doesn't match up with the <LeaderHeadInfos> or something like that tag, which it doesn't, but I've got LeaderHeadInfos closed off, and the other is for the one with the schema, and it shouldn't be messed up, as all I did was copy it from the original file.