Exactly what the title says, when I make an overlay and run the map, it just ends up being a black square. I'm sure the reason is simple, but I haven't been able to find anything about it.....
I had this same problem once ill see if i can remember what it was. Ok I couldnt find my post so im going to guess. I believe it was caused by a leak. if no leak look for your env entities.
I had this.
Ya just whack some lights in.
I know it seems like there is light on the map, but it's an automatic thing.
Just add some light entites in, and voila, instant overlay!
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