No, the “Playlist” item was not displayed. I have uninstalled all the plugins that I have installed after “cue”. There was no effect. Perhaps the plugin is incompatible with the current WP version (4.7.0). Because before the update it went. Perhaps that would be a hint.
Thank you for your help. I have installed a different playlist first. I will install Cue again soon and report you the result. You’re really helpful. Thanks for the effort.