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just a qu: How did you get the "Details", "Lyrics" buttons to appear above the right hand side [ "Playing track" ] header ? If I select "customise" via right click on the "Track Information" (which I have where you have those buttons) and enable Lyrics, I cannot see them.
It's hard to know without a close look at your settings, but this might help you figure it out: http://musicbee.wikia.com/wiki/Right_Sidebar