I'm a little stunned by the "errors". The first time I played it, I didn't recieve the infamous "red X" error. But, today, I had the error twice (which is what virtually everyone else has seen).
Also, when swetooth9 and sj41 would send me party invites, I'd either get the "red X" or it would send me to the multiplayer sign in screen.
I gave up on it for the night...