Try the instructions under "Revert to factory settings" in the Handbook. if that does not help, please ask for help in the Support forum (or, from within MuseScore, Help / Ask for Help) - probably there is some other configuration problem on your computer.
Comments
Try the instructions under "Revert to factory settings" in the Handbook. if that does not help, please ask for help in the Support forum (or, from within MuseScore, Help / Ask for Help) - probably there is some other configuration problem on your computer.