Operating system: Windows 10 (Home)
Graphics card: Nvidia 2070
Broken: 2.90.0 (Steam)
Worked: Not sure, Has been like this since before 2.79b
When the default select mode is changed from Left to Right Mouse button Lasso Select no longer works with Tweak + RMB Any.
Splash Screen Change on initial set up or Select button or Edit - Preferences - KeyMap - Select With Mouse Button
**Exact steps for others to reproduce the error**
See attached MP4.
Based on the default startup or an attached .blend file (as simple as possible).