Rail Omas

Perhaps I can get a bit of Help too. When I complete the Campaign Mission: Blackfoot, I return to Maxwell. But when I get ready to sally forth and begin another mission; I get booted to the Main Screen to begin the game. And when I choose to continue the mission(Death Valley in this case) it sends me back to just before the firefight where you have to defend the Helo from attack. I'm getting fed up and nothing I do works. I need some help, this is just after the 1.68 Update.