[BUG] Flatpak version showing gray screen after Subsonic extension setup

[xynydev]

Describe the bug I just installed the Flatpak version of the application due to my interest in the subsonic-compatible streaming support. After skipping all other setup to go and install and configure the Subsonic extension, I restarted the app because the library was empty. I thought that a restart would fix the issue, but instead I am now greeted with an errorless gray screen when launching the app.

To Reproduce Steps to reproduce the behavior:

1. Run flatpak install flathub app.moosync.moosync on a compatible Linux system
2. Disregard all setup and go to settings / extensions
3. Download the Subsonic extension and set it up with the correct server details
4. Library fails to populate and app is gray after a restart.

   • Restart CLI logs:

        ❯ flatpak run app.moosync.moosync 
        [3:0417/182210.282289:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
        LaunchProcess: failed to execvp:
        xdg-settings
     

Expected behavior Ideally, the library should populate immediately with Subsonic content, or there should be some popup warning of wait time. Also when the program start it should exit with an error or display an error message on screen instead of being stuck as a gray non-functional window.

Screenshots If applicable, add screenshots to help explain your problem.

• OS: Fedora Silverblue 39 (Xorg)
• Moosync Version: Flatpak 10.3.2
• Subsonic server: Gonic

Additional context After removing .var/app/app.moosync.moosync/, effectively reseting all previous configuration, the application started working again. Doing the steps described above again did not cause the application to not work at all. However, the songs from Subsonic still did not fully populate, with only individual songs being available either in the "Starred" and "All Songs" playlists, or the search (when searching for songs specifically). Songs in albums or data of artists was not available.