We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Its to do with when the game the are playing started. That's why gears 3 updates the playlist every time you sign into the game. If a host has a different playlist means they are playing a game from 'yesterday' If they quit out and start a new game you will
be able to join