Currently the texture is displayed in the viewport only if the image shader is the root in the material. I bet it's not the case for you (e.g. you have a color_correct shader after the texture).
It should be fixed and display the texture in this case as well. Strange that it never came up before.
Just to clarify, because of some technical limitations, I probably won't be able to display the actual output of the network, just the texture itself. So for instance if there's a color_correct shader after the image, its effect won't be displayed in the viewport. Maybe that will improve in later versions, but not intended in this fix.
Thank you Peter, after several temptations it worked but I don't know why and how and what I didi??!!,now it works, I think it was a bug, I just had a texture in arnold sky as Hdri.