The problem is this: In the render view it seems that a kind of shadow of the object remains in the object itself when you turn around the object. It's dark gray. Materials and lights stop working. After I press f12 the image is rendered but the object is rendered transparent. What can I do?
I have already completely reinstalled Blender.
https://gyazo.com/162b9c83c187ada0c840f3ec57b1d238 And after moving it a bit: https://gyazo.com/1a82380907ab00fb1215f805229acc19 And the render: https://gyazo.com/b895d9fd28b06e82e91edb0beb3bda84
