System Information
Operating system: Windows 10
Laptop: HP250 G6 Notebook PC

Blender Version
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Worked: (optional)

When Im going in the LookDev mode the Cube turns invisible and Materials dont show like you can see on the Screenshot. This Bug is with any Object.