I have uploaded Blender 2.83 and when I use Viewport Shading, Material Preview my object appears to not register - the blur in the image is the result of moving the view so Blender has blurred whatever it thinks is behind the object of which it appears to be rendering as transparent.
The 'solid' objects in the screenshot do not have a material assigned to them so it's clearly something to do with the Materials Editor. Please note that I am not applying any textures to the objects, just the Materials Shader. The models in both pictures are the same but the second picture was taken using Blender 2.8 so obviously this is a 2.83 issue but I do not know how to resolve it. Please can someone advise.