Thanks for your explanation, Eric.
I wasnt aware of the cubemap in the thumbnail.
Now, here it is in the default scene. I changed the textures a little, to see if it had something to do with those as well, but of course, that still doesnt explan the difference between these two.
What else is there in the material view, besides the cubemap? Any other settings I need to change/replicate?
I simply have no idea what is going on here. If nothing worked, that would be easier to understand, but that the thumbnail works and the level doesnt, makes no sense to me ./
I can understand if you are starting to give up on me as well, Eric 
