I am using Nuvola Player 1.0.3. Distribution is Ubuntu 12.04 beta (latest build) 64-bit. I installed Nuvola using the Stable ppa.

The debug output was me:
1) Opening it using nuvolaplayer --output
2) Closing it to restore the screen
3) Reopening it
4) Pressing restore songs
5) Closing it so the songs are restored
6) Reopening it to play the songs (with no success, I ended up using the media buttons on my keyboard)....

The output is below.

The Flash version is 11.1 r102.

The library versions (gotten by running the last command from the page above) are:

 libgtk2.0-0 libglib2.0-0
libglib2.0-0	2.31.20-0ubuntu3
libgtk2.0-0	2.24.10-0ubuntu5
libsoup2.4-1	2.37.91-1
libwebkitgtk-1.0-0	1.7.91-0ubuntu1

Let me know if there is anything else I can do. :)

Debug Output


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Nuvola     Info Welcome to Nuvola Player, version: 1.0.3
    Nuvola     Info Report any issues/bugs you might find to https://bugs.launchpad.net/nuvola-player
    Nuvola    Debug command: nuvolaplayer --debug
    Nuvola    Debug Built with GLib DBus
    Nuvola    Debug Built with libsoup cache
    Nuvola    Debug Built with Unity Quick List
    Nuvola    Debug Built with User scripts support
    Nuvola    Debug Crash dialog disabled.
libfenryxo    Debug No proxy settings applied.
    Nuvola    Debug Valid 'sandbox_pattern = https?://grooveshark.com/' in /usr/share/nuvolaplayer/services/grooveshark/metadata.conf.
    Nuvola    Debug Starting web interface for grooveshark: http://grooveshark.com/#!/
    Nuvola    Debug New page request: URI: http://grooveshark.com/#!/, frame URI: null
    Nuvola    Debug Unity Launcher Entry for nuvolaplayer.desktop
    Nuvola    Debug Bus acquired: org.mpris.MediaPlayer2.nuvolaplayer, registering objects
    Nuvola    Debug GNOME session appeared: org.gnome.SessionManager, :1.4
    Nuvola    Debug Bus name acquired: org.mpris.MediaPlayer2.nuvolaplayer
    Nuvola    Debug GNOME settings daemon appeared: org.gnome.SettingsDaemon, :1.10
    Nuvola    Debug Sound menu vanished: com.canonical.indicators.sound
    Nuvola    Debug Panel icon: Ubuntu Sound menu visible: false
    Nuvola    Debug Action: view
    Nuvola    Debug Action: options
    Nuvola    Debug Action: help
    Nuvola    Debug Installing service to the new window object
djview: QDjViewPlugin::exec() begin
No bp log location saved, using default.
[000:000] Browser XEmbed support present: 1
[000:000] Browser toolkit is Gtk2.
[000:000] Using Gtk2 toolkit
djview: QDjViewPlugin::exec() begin
 <unknown>    Debug NP_Initialize
 <unknown>    Debug NP_Initialize succeeded
GnomeShell    Debug plugin loaded
ERROR: Invalid browser function table. Some functionality may be restricted.
[000:051] Warning(optionsfile.cc:47): Load: Could not open file, err=2
[000:051] No bp log location saved, using default.
[000:051] Browser XEmbed support present: 1
[000:051] Browser toolkit is Gtk2.
[000:051] Using Gtk2 toolkit
 <unknown>    Debug NP_Initialize
 <unknown>    Debug NP_Initialize succeeded
 <unknown>    Debug NP_Initialize
 <unknown>    Debug NP_Initialize succeeded
 <unknown>    Debug NP_Initialize
 <unknown>    Debug NP_Initialize succeeded
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (6b24-1.11.1-3ubuntu3)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
    Nuvola    Debug Executing script /usr/share/nuvolaplayer/services/main.js
    Nuvola    Debug Executing script /usr/share/nuvolaplayer/services/grooveshark/integration.js
    Nuvola    Debug No user scripts enabled
    Nuvola    Debug Dock vanished: net.launchpad.DockManager
    Nuvola    Debug On close: hide
    Nuvola    Debug http://static.a.gs-cdn.net/gs/core.js?20120312.01 619: $.localize has english
    Nuvola    Debug Actions changed: 128 → 140
libfenryxo    Debug Starting new thread 'Update dock item'
    Nuvola    Debug Nothing to update
    Nuvola    Debug MPTIS Player: can-go-previous changed
    Nuvola    Debug MPTIS Player: can-go-next changed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
    Nuvola    Debug http://static.a.gs-cdn.net/gs/app.js?20120312.06 968: FB initialized
    Nuvola    Debug Application activated
    Nuvola    Debug Action: view
    Nuvola    Debug Action: options
    Nuvola    Debug Action: help
    Nuvola    Debug Application activated
    Nuvola    Debug Media key pressed: nuvolaplayer, Play
    Nuvola    Debug JS API command(3)
    Nuvola    Debug http://grooveshark.com/#!/ 121: GrooveShark: comand '3' executed.
    Nuvola    Debug On close: hide
    Nuvola    Debug Actions changed: 140 → 141
libfenryxo    Debug Starting new thread 'Update dock item'
    Nuvola    Debug Nothing to update
    Nuvola    Debug Playback state changed: none → paused
    Nuvola    Debug Playback: paused
    Nuvola    Debug MPTIS Player: playback-status changed
    Nuvola    Debug MPTIS Player: can-play changed
    Nuvola    Debug MPTIS Player: can-pause changed
    Nuvola    Debug Album art changed: null → http://images.grooveshark.com/static/albums/70_1782197.jpg
    Nuvola    Debug Artist changed: null → 絢香
    Nuvola    Debug Song changed: null → Stay with me
    Nuvola    Debug Album changed: null → First Message
    Nuvola    Debug MPRIS: song changed
    Nuvola    Debug MPTIS Player: Metadata changed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
    Nuvola    Debug  0: Unsafe JavaScript attempt to access frame with URL http://grooveshark.com/#!/ from frame with URL http://ad.doubleclick.net/adi/N3271.24-7RealMedia/B6376437.30;sz=160x600;pc=[TPAS_ID];click0=http://network.realmedia.com/RealMedia/ads/click_lx.ads/grooveshark_ca/ros/160x600/jx/ss/a/L34/365563895/x10/USNetwork/BCN2012010633_019_PrincessCruises/PC_RON-CA_160.html/526159575555396c4149304141643861?;ord=365563895?. Domains, protocols and ports must match.

    Nuvola    Debug Application activated
    Nuvola    Debug Action: view
    Nuvola    Debug Action: options
    Nuvola    Debug Action: help
    Nuvola    Debug On close: hide
    Nuvola    Debug Application activated
    Nuvola    Debug Action: view
    Nuvola    Debug Action: options
    Nuvola    Debug Action: help
    Nuvola    Debug On close: hide
    Nuvola    Debug Media key pressed: nuvolaplayer, Play
    Nuvola    Debug JS API command(3)
    Nuvola    Debug http://grooveshark.com/#!/ 121: GrooveShark: comand '3' executed.
    Nuvola    Debug Actions changed: 141 → 142
libfenryxo    Debug Starting new thread 'Update dock item'
    Nuvola    Debug Nothing to update
    Nuvola    Debug Playback state changed: paused → playing
    Nuvola    Debug Playback: playing
    Nuvola    Debug MPTIS Player: playback-status changed
    Nuvola    Debug MPTIS Player: can-play changed
    Nuvola    Debug MPTIS Player: can-pause changed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed
LIBDBUSMEN Critical dbusmenu_menuitem_get_children: assertion `DBUSMENU_IS_MENUITEM(mi)' failed