With GNOME 3.0 (april 2011), the GNOME Project decided to discontinue GConf. It won't be maintained anymore: bugs and security holes will not be fixed. Thus, spotify shouldn't depend on GConf any longer. Please, migrate to GSettings. GStettings is the official GNOME replacement for GConf, and the GNOME project is porting all of its applications to it: https://live.gnome.org/GnomeGoals/GSettingsMigration
Please bear in mind that the Community is not an official Spotify support service. It's a place where we all help each other, whether we work for Spotify or not. So please use your discretion when using the forum.