-R option deletes user preferences
The documentation of the
-R option indicates that one can use it to temporarily use factory settings, but keep the user settings.
However, this is not so. After I did…
musescore3 -R -o x.pdf somefile.mscx
… my user settings were destroyed (which I did not want, which is precisely why I used the
-R option instead of the
In MuseScore 3, using factory settings for such a conversation is necessary because otherwise it applies the chosen user style to all files, instead of just at new score creation (which is a regression, even if it may be desired behaviour, or it may be a bug).