Actually what you are seeing is that Docky starts before Metacity's compositor does, and it warns you of such. It is a race condition during startup and nothing we can do about it. You can set a delay in starting Docky (to give time for the compositor to start) or just live with the popup.
Actually what you are seeing is that Docky starts before Metacity's compositor does, and it warns you of such. It is a race condition during startup and nothing we can do about it. You can set a delay in starting Docky (to give time for the compositor to start) or just live with the popup.