Rhythmbox shows old thumbnail

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http://askubuntu.com – When I listen to a playlist in Rhythmbox, whenever a new song starts, a message will pop up in the top right of the screen, with the title of the song, but the thumbnail of the previous song. When I open the Rhythmbox window, the thumbnail in the bottom left will also be the one of the previous song, but when I hover over the speaker in the top right, I can see the correct thumbnail. I'm using Ubuntu 12.04. Does anyone know how to fix this? (HowTos)