I opened my file to continue where I left it last night, and I found that in solid and wireframe mode there is this strange artifact… buf… It is too hard to explain. Please check out this screenshot:
It is as if my model has been trapped by that strange shape… that is not a shape anyway. But it has the shape of an extremelly long piramid with a square base.
Then, new objects that are added to the scene appear to have an emission shader applied, although they have not.
Do not know what’s going on…