That is a terrible issue, thank you for contacting us. We are investigating the issue, however, some help would go a long way to speed up the fixing process.
Can we please see a picture of how your Adventure panel looks like? Make sure that all the mission/campaign boxes in the lower left are visible.
We need to know whether the problem is on our end or not. I asume everyone here is trying to play on an Xbox, is that right?
Also; which region are you from?