Firstly, thanks very much to the PA team for releasing Musescore4 as a portable app.
I've noticed a strange (and alarming!) behaviour in Musescore4: whenever I exit the program, all the folders used to store the various user-created files get deleted from my hard drive. They are not available in the recycle bin. I set the Musescore preferences to store files in 'Documents/Musescore4/xxxxx' where 'xxxxx' is 'Scores', 'Styles', 'Templates' etc.
As I say, when I close the program these folders, including the parent 'Musescore4' folder get deleted from the hard drive. Obviously all the files contained therein are also gone. Strangely, when I re-launch Musescore4, the folders and files are returned.
Has anyone else experienced this and/or can anyone shed any light on why this is happening or provide a fix?