@marciton: Can you try checking the "Adjust wallpaper for Active Desktop" in the Wallpaper window? Let me know if that makes any difference. Also, are you using an application called "Fences" by any chance?
In an effort to cleanup the DisplayFusion forum, this topic is being locked and archived because it applies to an older version of DisplayFusion. If you are using the latest version of DisplayFusion and would still like some assistance, please create a new topic and I'll be happy to help you out. Thanks!