Problems with MW2 party invite.

I know that Infinity Ward and PS network have been showing big problems in connecting their players to a party invite. Well, here is a tip on how to make this work: once you are in the multiplayer main lobby, send your friends an invite. All of your friends have to hit PS button go to account management (without quitting game), sign out and quickly sign back in, then go to your friends invite message and JOIN. That's it!!! you should be able to join your friend's party after that. Hopefully they will be fix this problem today. At least that was the last I heard.