C'mon! BIG THANKS for You! For response, idea, work & Your time.  :)
This mis my debug without sudo, maybe this will tell You something :)

michal@md:~$ nuvolaplayer --debug
    Nuvola     Info nuvolaplayer.vala:153: Welcome to Nuvola Player, version: 2.5
    Nuvola     Info nuvolaplayer.vala:157: Revision: 862, <email address hidden>
    Nuvola     Info nuvolaplayer.vala:158: Report any issues/bugs you might find to http://nuvolaplayer.fenryxo.cz/support/bug_reporting.html
    Nuvola    Debug nuvolaplayer.vala:159: command: /usr/lib/nuvolaplayer/nuvolaplayer --debug
    Nuvola    Debug nuvolaplayer.vala:161: Enabled features: Unity Quicklist, optimization of SVG images, Last.fm scrobbling, Notifications, debug symbols
    Nuvola    Debug nuvolaplayer.vala:162: Disabled features: experimental features, debug memory usage
       Gtk    Debug Connecting to session manager
    Nuvola    Debug nuvolaplayer.vala:244: Starting new instance
   Diorite    Debug Libsoup version: 2.44.2
    Nuvola    Debug nuvola-formatsupport.vala:97: Unable to init GStreamer 1.2.4, maybe already initialized
    Nuvola    Debug core.vala:59: Cache model: default
   Diorite    Debug Max data cache size: 100
   Diorite    Debug Setting proxy (auto): dynamic resolver
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "unity-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
    Nuvola    Debug nuvola-formatsupport.vala:213: WebPlugin: Shockwave Flash (true): /opt/nuvolaplayer/flash/wrapped/npwrapper.libflashplayer.so
    Nuvola    Debug nuvola-formatsupport.vala:139: Built with Gstreamer 1.2.4
    Nuvola    Debug nuvola-formatsupport.vala:117: GStreamer 1.2.4 launch playbin uri=file:///usr/share/nuvolaplayer/audio/audiotest.mp3
    Nuvola    Debug unity_quick_list.vala:67: Unity Launcher Entry for nuvolaplayer.desktop
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'unityquicklist' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'trayicon' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'mpris' loaded.
    Nuvola    Debug notifications.vala:113: Notifications: persistence false, actions false, icons false
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'notifications' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'lastfm' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'dockmanager' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'lyrics' loaded.
    Nuvola     Info extensionsmanager.vala:91: Extension with id 'mediakeys' loaded.
    Nuvola  Warning servicesmanager.vala:98: Unable to load service from /home/michal/.local/share/nuvolaplayer/services/spotify: /home/michal/.local/share/nuvolaplayer/services/spotify is not a directory
    Nuvola    Debug servicesmanager.vala:105: Found service Spotify at /usr/share/nuvolaplayer/services/spotify, version 1.0
    Nuvola     Info servicesmanager.vala:118: Using service Spotify from /usr/share/nuvolaplayer/services/spotify, version 1.0
    Nuvola    Debug notifications.vala:216: Show notification
    Nuvola    Debug notifications.vala:216: Show notification
    Nuvola    Debug webbackend.vala:142: Starting web interface for spotify: https://play.spotify.com/
    Nuvola    Debug mpris.vala:110: Bus acquired: org.mpris.MediaPlayer2.nuvolaplayer, registering objects
    Nuvola    Debug mpris.vala:295: MPRIS Player: can-play changed
    Nuvola    Debug mpris.vala:295: MPRIS Player: can-pause changed
    Nuvola    Debug mpris.vala:295: MPRIS Player: can-go-previous changed
    Nuvola    Debug mpris.vala:295: MPRIS Player: can-go-next changed
    Nuvola    Debug mpris.vala:314: MPRIS: song changed
    Nuvola    Debug mpris.vala:295: MPRIS Player: metadata changed
    Nuvola    Debug mpris.vala:295: MPRIS Player: playback-status changed
   Diorite    Debug XFCE session vanished: org.xfce.SessionManager
   Diorite    Debug GNOME session appeared: org.gnome.SessionManager, :1.23
    Nuvola    Debug mpris.vala:126: Bus name acquired: org.mpris.MediaPlayer2.nuvolaplayer
    Nuvola    Debug dock_manager.vala:358: Dock vanished: net.launchpad.DockManager
    Nuvola    Debug media_keys.vala:200: GNOME settings daemon appeared: org.gnome.SettingsDaemon, :1.15
    Nuvola    Debug notifications.vala:228: Show notification callback
    Nuvola    Debug jsapi.vala:831: Window object cleared in frame '__main__'.
    Nuvola    Debug jsapi.vala:921: JSAPI injected successfully in frame '__main__'
    Nuvola     Info nuvolaplayer.vala:322: Logged in as  ()
    Nuvola    Debug webbackend.vala:242: Widget blocked: 
    Nuvola    Debug jsapi.vala:793: document loaded in frame '__main__'.
    Nuvola    Debug webbackend.vala:242: Widget blocked: https://fbstatic-a.akamaihd.net/rsrc.php/v1/yM/r/3HouGtHOOHI.swf
    Nuvola    Debug uiparser.vala:183: SimpleUIParser: ignored ui
    Nuvola    Debug uiparser.vala:214: Destroy