nud material editor not diffusing textures

when i go to the material editor and i click on diffuse everything works fine but when i close the material editor everything resets what do i do?

Reproduce the issue by opening the material editor, changing the diffuse texture, and closing the editor to confirm whether the change resets. Trace the material editor's save or close behavior and consider the work complete when the selected diffuse texture persists after closing and reopening the editor.

Written by the indexing model from the issue text.