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. ** Bug watch added: GNOME Bug Tracker #670038 https://bugzilla.gnome.org/show_bug.cgi?id=670038 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/923242 Title: Cannot restore rhythmbox from notification area in gnome-shell after closing window To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/923242/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs