I just had this problem.
I was in queue, and I forgot to respond. So I clicked to go into queue again, but the client said I was already matched in game. This happened as I was in the front screen, where you can see featured games. I relogged, and the screen with the Orange Button "Reconnect to game" appeared. I clicked it, it greyed out, and nothing happen.
Also, I asked one of my friends to invite me to a lobby. On his end, he was able to invite me, but the client told him that I automatically declined. On my end, I never got an invite.