Custom Buildings

[mkr8683]

I've been able to create new terrain icons just fine, but for some reason, the building icons are being stubborn. The new ones will not appear in-game. After countless clicks cycling through single-hex buildings to find the custom one, and even filling a whole map with single-buildings and not even seeing it that way, I've become frustrated. Are the building SHPs any different than other terrain SHPs? I'm only editing the z4, and I'm giving it the correct file name.