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Running pacman -Su caused gtk2 to be upgraded from 2.12.0 to 2.12.1. After the system update many of the button icons in Rhythmbox were missing. Running Rhythmbox from a console showed errors regarding an inability to access specific themed icons. Also, Nitrogen would not run, with the console showing the error:
terminate called after throwing an instance of 'Gtk::IconThemeError'
Aborted
I downgraded gtk2 back to 2.12.1. I also downgraded gtkmm (2.12.1 to 2.10.10) due to dependency on gtk2. This corrected both issues above.
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