Preferences not saved
1) Edit -> Preferences
2) Change any setting
3) Quit MuseScore
4) Restart MuseScore
5) Edit -> Preferences : The setting modification has not been saved.
User preferences changes (through the "Edit->Preferences..." menu) are effective during the MuseScore session, but are not saved. When MuseScore is stopped and restarted, all changes are lost.
I started MuseScore from a terminal. The change of user preferences adds the following error message :
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1550, resource id: 31457916, major code: 40 (TranslateCoords), minor code: 0
I use MuseScore 3.0.5 (revision 58dd23d) with Linux/Kubuntu. The used Qt version is 5.9.3.