Hello there ! I ran into a strange problem yesterday. I was making some quick lighting tests in a very basic scene lit only by an area light and an HDRI. The scene is completely closed (four walls + floor and ceiling), with the light source and camera inside the room.
Now, when I hit shift+Z to get my viewport render this is what I’ve got :
That’s one of the first things I’ve checked but everything is okay : no layer was excluded. Anyway, I made a new .blend and imported all of the furnitures in, except for the walls and light and now it renders perfectly fine. I’m curious of what could’ve caused this problem, though.