I Just ticked the "World Background" box and now everything shows up. 
in the third picture, i loaded factory settings and now everything is ok. but if i restore the program i will loose all my configurations. I will try to export them, reinstall blender and load them again.
as you can see in the second picture once again the world environment is completely black. nodes are shown. thanks! Tnanks so much for your help in advance. 
in the third picture, i loaded factory settings and now everything is ok. but if i restore the program i will loose all my configurations. I will try to export them, reinstall blender and load them again.
as you can see in the second picture once again the world environment is completely black. nodes are shown. thanks! Tnanks so much for your help in advance. 
I Just ticked the "World Background" box and now everything shows up. 
in the third picture, i loaded factory settings and now everything is ok. but if i restore the program i will loose all my configurations. I will try to export them, reinstall blender and load them again.
as you can see in the second picture once again the world environment is completely black. nodes are shown. thanks! Tnanks so much for your help in advance. 
in the third picture, i loaded factory settings and now everything is ok. but if i restore the program i will loose all my configurations. I will try to export them, reinstall blender and load them again.
as you can see in the second picture once again the world environment is completely black. nodes are shown. thanks! Tnanks so much for your help in advance. 
in the third picture, i loaded factory settings and now everything is ok. but if i restore the program i will loose all my configurations. I will try to export them, reinstall blender and load them again.
as you can see in the second picture once again the world environment is completely black. nodes are shown. thanks! Tnanks so much for your help in advance. 
I have something I am trying to manage with: I am trying to set
as you can see in the colour ofsecond picture once again the "environment" or "world" to white (like in picworld environment is completely black. 1); I try to set panels like in pic 3, but I obtain the result asnodes are shown in picture 2. The question is: WHY? thanks! Tnanks so much for your help in advance. 