I turned on the Show Lyrics in Floating Window option in the mini player. Then if I click the maximize button on the mini player to the regular window to say select a new song, and then click minimize to go back into the mini player after I'm done, the lyrics floating window will be gone. When I right click on mini player it still shows that option is enabled, but I have to uncheck and check it to have it back. It seems that the minimize operation is causing the floating window to disappear.