Can't join any world or invite, XBL Bug ?

Hello,

I can't join any world or invite any friend in mine, and I don't know why, yesterday I played the whole day (I was already in beta 1.5.0.0) and I played with friends on my world, but today I don't understand why it doesn't work, maybe its because I got the connexion button unclikable ? Look this screen http://prntscr.com/jbkduz (Proof 1) but it show me my Gamertag and my achievement so I guess im connected !

And when I go in any world setting I got this http://prntscr.com/jbkf4g (Proof 2) The "multiplayer Game" can't be turned on when I click, what is the issue ?

Sorry for my poor english