After an upgrade to Kubuntu 14.04 and to Rhythmbox 3.02 the control buttons in the upper left corner (play/stop, next/previous song, repeat, shuffle) and other icons (music library, libre.fm etc.) are not displayed properly.
Instead it shows an icon like a document with a question mark. They work, but don't look very nice. I tried reinstalling Rhythmbox, but that didn't help. What could be wrong?
I've tried the Gnome-Icon-Theme package and it tells me the newest version is already installed. The same for the Humanity-Icon-Theme.