I am having an issue inviting my friends with the new invite system, every single time one of us tries to invite another, a message pops up saying "The game you are trying to join is no longer available" or something to that nature, anyone know why this is happening?

all restart your ps3's and restart the room, this is how me and my friends solved this problem

Probably a NAT type problem. Make sure all of you have either NAT 1 or 2 in the connection test. You don't all have to have the same NAT type just as long as its either 1 or 2. If any of you have NAT 3 change it to NAT 1 or NAT 2. This is usually done through your router.

If you are all NAT type 1 or 2 then in game make sure the NAT type says open and not moderate or strict. If it does say moderate or strict you will then need to change this through your router again.

I hope this helps but if you are still having problems let us know.