from one day to another all my projects have the same problem, all materials are invisible and when i render them appears like a inverse .png. I dont know what happened, also the default project had the same error. Someone can help me with this?
There have been various reports of graphical issues just like these with Blender when using an AMD GPU with driver version 20.11.2. If you're using an AMD GPU, try downgrading your GPU drivers.
If that doesn't help, are you able to provide us with more information about your computer so we can better try and help you? This can be done by selecting from the top of Blender Help - > Save System Info then saving the file somewhere. Upload this newly saved file to this site so we can take a look at it.
You also seem to be using Blender 2.80. Since then, version 2.81, 2.82, 2.83, 2.90, and 2.91 have released. Are you able to try updating to one of these versions and seeing if that helps?