I made an account just to write this:
It's Pallas.
In the .txt file for Pallas, it says to use the planet texture "Pallas," but no such texture exists. Thus, the game breaks when you put in the asteroids. You can put in individual asteroids and their textures just fine (ie. Juno, Ida and Dactyl, etc.), but once you try to add something without a corresponding texture (Pallas) the game doesn't work.