Unable to start mission

When I click to play a challenge, sometimes the UI goes away, indicating that the challenge is about to start, but the challenge never does. I click on the settings/menu button on my controller, but the challenge UI does not show up either, so I can't quit the challenge. 

What happens is I start the challenge, my UI goes away, I can still fully run around and do tricks, all the players are gone, and now I have to restart the game.