I landed here also seeing the bug in Rhythmbox 0.12.8 Ubuntu 10.04.
The only thing that worked for me was logging out of Gnome session.
I imagine this resets all of the nautilus/dbus/gnome plumbing.
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Towards the statement "This is really not an important bug": it is
blatantly visible to the end user; it is reproducible; it should be
straightforward to fix (I'm not a Gnome developer though I have worked
in other GUI systems).
The workaround (restarting gnome-panel:
http://mylinuxnotebook.blogsp