System Information
Operating system: Mac OS 10.14.5
Graphics card: Radeon Pro 560 4 GB

Blender Version
Broken: RC 2.8
Worked: July 11

Short description of error

No Add-on menu in preferences. No Cycles

No tool bar on Left.

No info in Help menu. ie. bug reporting.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).