Have you tried to check the "Use Lights" Checkbox (see screenshot)?
Mon, Aug 3
Mar 13 2020
Mar 9 2020
Mar 6 2020
In my morningly build with hash a4bfe6267943 it is fixed.
Mar 5 2020
I also can reproduce it on a Surface Pro 4 (see attached system info, can test on the Linux System today evening) with both files @Germano Cavalcante (mano-wii) suggested.
With the Viewportshading set to Material Preview or Rendered I can see the gradients, rendered looks the same as viewport mode Solid
Another thing, isn't D6293 on geasepencil-object, or at least merged into greasepencil-object?
Here is the file i created for the screenshot:
Mar 4 2020
Feb 24 2020
Thanks for this clarification.
Switching nodes of in the world settings indeed solves it for me.
Feb 23 2020
Can reproduce in
Date: 2020.02.23 17:27