MacOS Mojave, WS 2021.2.4
When I updated from 2021.2.3 to 2021.2.4, my projects display a warning that WS can't find executables in my PATH (can't find npm, for example). Also, WS apparently can't find many of my settings -- my default browser, ESLint settings, are reset. When I change them, WS reverts them next time I open it.
Downgrading to 2021.2.3 solves all of these issues.