Map not showing up in the viewer

[darkely]

I cannot seem to get my level (a floor with no walls or roof yet) to work in the "map viewer". I have the player start area already set. I've attached the map file and here are some screenshots...

Level Editor

Spoiler below!

Map View (nothing):

Spoiler below!

It's got to be something stupid I forgot to add in. Thanks in advance.

[DeAngelo]

Tick the "Ambient Active" button in the mapviewer. Hold alt and left mouse button and drag the mouse around to turn the camera and you'll see your floor. I've never used the mapviewer though since I don't see the point of it. (probably is one I just don't see it.)

[Romulator]

Map Viewer starts facing the side Just control it as if you were looking through the Level Editor. If worse comes to worse, chuck in a few pointlights to make sure that you can actually see some light.
In the Level Editor, down the bottom, there are two buttons; A and P. Turn them off. If you cannot see your floor very well, make the boxlights a little bigger