As of today, Clementine will not display any internet playlists while being configured.

For instance Spotify, for which I have a premium account, will not display the playlists. I configured the Spotify plugin correctly and I am logged in, cause when I use search, tracks from Spotify show up as search results (I am also able to play them).

Opening Clementine via the XFCE terminal gives these results when opening the internet section and try to open a Spotify playlist:

Code:
13:38:36.377 WARN  unknown                          QPainter::pen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::drawPath: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::brush: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::pen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::pen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::brush: Painter not active 
13:38:36.377 WARN  unknown                          QPainter::pen: Painter not active 

13:38:41.736 WARN  unknown                          QPainter::brush: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.736 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setWorldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::brush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::worldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setWorldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::brush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setWorldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::brush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::worldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setWorldTransform: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::opacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::brush: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::pen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.737 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::drawPath: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::setBrush: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::setPen: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::setOpacity: Painter not active 
13:38:41.823 WARN  unknown                          QPainter::restore: Unbalanced save/restore 
13:38:41.823 WARN  unknown                          QPainter::end: Painter not active, aborted
My question is: what the heck is the Painter and how do I start it?

Or, should I clear my Clementine cache (if so, how)?