I've reported this upstream (https://bugzilla.gnome.org/show_bug.cgi?id=670038), and a Rhythmbox developer replied that this problem was "a consequence of an Ubuntu-specific patch."
In case I wasn't clear, the problem is with restoring Rhythmbox from Gnome3's Message Tray in the lower-right corner.
I've reported this upstream (https:/ /bugzilla. gnome.org/ show_bug. cgi?id= 670038), and a Rhythmbox developer replied that this problem was "a consequence of an Ubuntu-specific patch."
In case I wasn't clear, the problem is with restoring Rhythmbox from Gnome3's Message Tray in the lower-right corner.