It worked a long time ago, but for a while I stopped using it. Now when I try it, DisplayFusionCommand.exe briefly appears in the processes list, then disappears, and the wallpaper doesn't change. If I run the entire command in a command prompt, the wallpaper doesn't change either.
Some other parameters, e.g., "-windowsettings" appear to work.
I can trigger wallpaper changes manually via the system tray icon > Desktop Wallpaper Settings > Load Next Image
Was the parameter removed in an update or something? It's still listed on the FAQ page.
We've actually fixed this issue up and reposted the DisplayFusion 4.2 installer. Please download and re-install 4.2 from the link below. No need to uninstall the existing version first, the installer will just overwrite it while keeping your settings intact.