[MDL ED] Changing material of plane_black

[Damascus]

I'm trying to make static entities out of planes, for example an entity for a castle floor, on the Model Editor by doing this:

1) Importing the plane_black .dae into Model Editor.
2) Selecting it and loading a different material into the .dae
3) Creating a body, connecting it, and saving it as an entity.

The .ent file now has this in it:

<Mesh Filename="static_objects/technical/plane_black/plane_black.dae">
<SubMesh Active="true" ID="0" Material="C:/Program Files (x86)/Steam/steamapps/common/amnesia the dark descent/static_objects/castlebase/castlebase_floor.mat" Name="Plane" Rotation="0 0 0" Scale="1 1 1" SubMeshID="0" Tag="" WorldPos="0 0 0" />
</Mesh>

However, when it loads into Level Editor, it still appears as a black plane. I have no map cache's, and I've reloaded it several times. It appears as a castle floor when I load it in the Model Editor, but not in Level Editor.