I'm working on a mod at the moment that changes the graphics for a great number of components. It works for all of them, except those that transport people: Colony, Troop, and Advanced Troop modules. For some reason, these modules lose their functionality when I change their graphics. When I hit the launch button, a slider comes up like normal, but it is disabled and a different color (with my UI interface color, it's normally red, but this one is yellow). I can make a ship with unmodded graphics for these components right afterwards, and it will work like normal.
Does anyone know why this is, or a way to get around it?