rhythmbox helper not working correctly on docky 2.2.0

[Unkuiri]

The rhytmbox helper in the docky rarely shows the cover-art, it is only showing the cover-art present in: "~/.cache/rhythmbox/covers/[covername].jpg"
Isn't recovering image from tag or checking rhythmbox dbus song properties.
In rhythmbox it shows the art normally.
I'm using gnome 2.30.2, ubuntu 10.04.3, docky 2.2.0 and rhythmbox 0.12.8.

If I use this command to get the path to file:
dbus-send --session --print-reply --dest=org.gnome.Rhythmbox /org/gnome/Rhythmbox/Player org.gnome.Rhythmbox.Player.getPlayingUri
I get this result:
method return sender=:1.145 -> dest=:1.212 reply_serial=2
   string "file:///home/unkuiri/M%C3%BAsica/Breaking%20Benjamin/Phobia/02%20-%20Breaking%20Benjamin%20-%20The%20Diary%20Of%20Jane.mp3"

And if I then use this other command and search for the string "rb:CoverArt-uri":
dbus-send --session --print-reply --dest=org.gnome.Rhythmbox /org/gnome/Rhythmbox/Shell org.gnome.Rhythmbox.Shell.getSongProperties string:'file:///home/unkuiri/M%C3%BAsica/Breaking%20Benjamin/Phobia/02%20-%20Breaking%20Benjamin%20-%20The%20Diary%20Of%20Jane.mp3'

The "rb:CoverArt-uri" is nowhere to be found.
I get this:
http://paste.ubuntu.com/659939/

Maybe here lies the problem...

[Unkuiri (unkuiri)]

I managed to solve it by installing the ppa rhythmbox version 0.13.1 from: https://launchpad.net/~webupd8team/+archive/rhythmbox
But this version has a worse integration on lucid desktop, specifically the icon on notification panel and the ubuntuone plugin doesn't work.
With this version I managed also to change the file rhythbox_controls.py in order to make it fetch the covers from Lastfm when I'm using the Last.fm plugin.
The final changed file is here:
http://paste.ubuntu.com/661148/

Hope this helps