Missing Textures Crash

I think this is a bug, it should be performed this way... if you add a building and the game files to find any of the textures which are part of the building then it goes back to main menu and pops a little dialog complaining about missing art, which i cant even read cause suddenly after that the illegal operation dialog comes in and only option is of course to close the application... i think this came in with mark's downloading code.. i dont recall it doing this before...
i bet it crashes when requesting the files and not finding it... it also happened to me with other mission textures and debuggin and saving the log says something about requesting texture and then crashes