issue...preview in the Surface window is black
@cucu change render engine then back and it will work...
It works to show it, but it doesn't update the preview slot when you make any changes to the material or surface settings.
You have to change engines and change back again to see the update or the change.
It's a little annoying but not too bad. Hope it's fixed soon as the same problem (not updating until you either move the window or minimize and maximize) also occurs in the VFB as its rendering.
The same problem also occurs intermittently in other preview windows like the environment and texture sample preview window in those settings like when you load an HDRI file for the environment.
Sometimes it shows, sometimes it doesn't and sometimes even when it shows and you rotate it for example, you don't see the sample slot updating respectively.