Fedora 22 KDE Recent upgrade from Fedora 20. My setup has 4 virtual desktops. Occasionally the wallpaper, application launcher and bottom panel disappears from all but one of the desktops. There is no pattern as to what causes this or the time after logon when this happens. I can switch between the virtual desktops and any windows that are open are displayed and can be used. The right click context menu works only on the workspace that still has the wallpaper. The Alt-Tab shortcut works on all workspaces and is the only way I can get windows back on on he workspaces without the background.