A bug or some hardware related problems, but cover images in the right side panel sometimes aren't changed. For example I choose to playback an album that has only one proper cover. Then I chose to playback another album consequently who has its own cover, but in the right side panel the previous cover is displayed. The same effect if I choose an artist from the left main panel or clicking songs to playback of an artist in thw main panel. If I click on a track to playback the cover are changed as usual. MB v. 3.2.6902
P.S. maybe it's hard drive dying who knows