In KiCad, go to Help / About KiCad.
Copy version info.
Check the file permissions on the configs.
Close KiCad, rename the config folder and then try and set preferences and see if it fixes it.
In KiCad, go to Help / About KiCad.
Copy version info.
Check the file permissions on the configs.
Close KiCad, rename the config folder and then try and set preferences and see if it fixes it.