System Information
Operating system: MacOS Mojave 10.14.5
Graphics card: Intel HD Graphics 4000 1536 MB

Blender Version
Broken: 2.80, d62a749fcf48, 2019-06-03 (splash screen info)

Dropdown Menus have a weird transparency, and others shows a line artifact across menus (as seen on pictures).

Just by pressing the "file" button, you can replicate the problem. This happens on any default startup .blend file.

The experimental release from mid May doesn't have this problem. I've tried different builds since May 31, and all of them have the same problem.