Operating system: win7x64
Graphics card: 1080ti
blender-2.80-855b3e68ef27-win64 and older
Broken: normal maps
ok, have a wall with normal map texture. my interface is splitted into 2 viewports. one little for preview and another one bigger for work. the walls are black in the little viewport if i connect a normal map since in the bigger viewport it is shown fine. attaching the example file bellow and the video of the bug.