Same problem here… everytime I save a setting, the button just keeps spinning.
This line shows up in the log:
ERROR - [Web] player.forwardCacheSize of type float has an invalid value: "157286400"
Changing or removing the player.forwardCacheSize in plex.ini doesn’t work either… it just returns.
Running Plex Deskop from flathub. Version 1.61.1.3432-3929cb60.
Running on KDE Neon(Ubuntu 22.04 base) and wayland desktop.