Clementine working again after an upgrade.  Thanks. 
Quodlibet has some bugs.  It wouldn't open at first from a menu entry.  It could open from terminal but only with this error message:
Code: Select all
$ quodlibet
W: UDisks2: Could not find 'media-player-info'.
W: UDisks: Could not find 'media-player-info'.
W: Couldn't connect to a device backend.
W: No device backend, Media Devices browser disabled.
After you closed the program or the terminal, it wouldn't open again even from terminal until you deleted all the songs/settings config files to force it to open the configuration settings window again. 
 I couldn't find any settings to disable a 
Media Devices browser.  Took some trial and error to discover that the Media Devices browser was just the  main Paned-Browser view.   Disabling that view is the only way to make the GUI open normally without terminal.