If the user has selected a starting directory in Opions > User interface that is not under the /Volumes/ path, this starting directory is not being used in the file browser on startup.

To reproduce:

1. In Options > User interface activate "Beging browsing in the following directory" and set a path not under /Volumes/, e.g. set it to /Users/yourusername/Music
2. Restart Picard
3. Open the file browser if it is not already visible

Expected result: The filebrowser has /Users/yourusername/Music set as the current directory

Actual result: No path is expanded and selected.

The reason is that the file browser only supports paths under /Volumes, so it would expect the path to be /Volumes/System/Users/yourusername/Music . The shorter /Users/yourusername/Music is not directly available.

File browser should extend the root path when loading paths and it also should strip the root path when saving path (e.g. via "Set as starting directory" context menu action).