What do you mean by rooms. Game Arenas or Private arenas. Cuz if some games aren't showing up, you can simply add the games to the list your self. Check out how here.
Its simple. Just download the newest CVS of XBMC from the usual source. Ftp the XBMC folder to e:\apps\ or f:\apps\. And your xbox should have it again.
Well I've been wondering for a while how to add new games to the games list. But I solved my problem pretty quickly and decided to share what I found out with all those people who also want the new ga ...