Hi, yes several reasons. Contributions to the games database need to be approved by a moderator, so are therefore queued and may not yet of been approved. Secondly, the actual database xml in launchbox is updated daily, but only if you add a new game or do something similar, like updating existing data, so you may not even have the most recent data, you may need to prompt it. Thirdly your submission may have been rejected. Best way to check is to go to the database on the site and search for what you added and see if its there yet. Hope that helps, any more questions fire away.