The material shader is not showing or not able to change. Only blank black shader is visible. blender 2.8 test release.
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question appears to be about an issue caused by a bug in Blender. These should be reported to the official bug tracker." – p2or, David
Blender 2.8 is still under development and until the official release is made there are many things that will not work correctly.
Information about reporting bugs in Blender can be found here: https://wiki.blender.org/index.php/Dev:Doc/Process/Bug_Reports