System Information
Operating system: Darwin-19.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon R9 M395X OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.16

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-19 16:45, hash: rB4f6051e8c466
Worked: 2.90

Short description of error
In Edit Mode, the wireframe overlays are not visible

Exact steps for others to reproduce the error

• Open Blender with default settings
• Enter Edit Mode

The wireframe overlay is not visible, and you cannot see the selected elements: