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I've started building a level to learn the SDK, and all seemed to be going well. I build a floor and some walls and put a light in so I could see.

Once that worked fine I went on adding other things. Once I got to a point where I wanted to preview it again... the entire map is 100% black when I click play. The light is still there and has not been moved.

I can't even see anything if I preview and point my flashlight directly at a surface.

Hopefully these pictures will illustrate when I'm seeing.

Normal view
Lighting view

I have absolutely no idea what I've done to cause this.