Campaign history and settings reset

@WeecekTry disabling Steam cloud sync. This may not be your issue, but it's a first step to try if it's not already disabled. Lately, Steam cloud hasn't been playing nice with more than a few titles. Sync problems have been causing people to lose saves or have saves overwritten. Again I realize this might not be your problem but it's a first step. Disabling Steam cloud won't cause you any problems, it will just remove the ability to have the same saves between different rigs is all. You will still have your normal local saves.

Unless of course you already disabled Steam cloud. Again I don't know if this is your problem, it's just an option you can try. I'd disable it, play a first campaign mission and win it, return to the main menu, quit, then relaunch and see if you can continue with the second mission(s).

EDIT: Someone was having this issue on Origin too, so, who knows. I hope you get this worked out. The campaigns are fun.