Roof model gone

[Prelauncher]

What do you mean they keep disappearing? Does it happen when you open the level editor then the map? Do you get a message like "file index out of bounds"? If so, then any model we give you would "disappear" too.

No message or anything. I can still place the model on the map with the editor but they´re invisible, both in the editor and the game. It happens when i open up the map in the editor.