What did wrong checked / unchecked in blender ? I have no unwraping in my UVEditor ?
I am on 2.82 - with default / Load Factory setting
The primitive cube created in the scene has position coordinates and UV coordinates defined in code.
However there are no “Marked Seams” so the unwrapper doesn’t have a clue how to unwrap the model.
To unwrap a model you would have to select edges and mark seams.
Thank you . I though the default cube had ‘integrated’ seams because of the first successful unwrap before reset. You are right, seams are necessary on default meshes .