System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 4400 Intel 4.3.0 - Build 20.19.15.4531

Blender Version
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: rB211b6c29f771
Worked: (newest version of Blender that worked as expected)

Short description of error
Themes don't work properly require restart Blender {F8577910}to work propelrly.

Exact steps for others to reproduce the error
Change the theme.