I'm starting to wonder why I spent money on Live. My friends and I would like to play a game together, but the invite system is not working. The only source of problem I suspect is my network setup. The Xbox is hooked up to my iMac via Ethernet which goes online through a wireless router. The firewall settings are correct for Live. Multiplayer works, it's just private chats and game invitations that doesn't work. I'm also having trouble getting Live Messenger to sign-in and the video marketplace won't load past the first menu or two, so I can't actually see any TV shows, movies, or music videos. Maybe all of these problems are related.