I don’t have a Phenom, but I do have an AMD processor and I’m running into exactly the same problem, so my specs might be helpful to the devs trying to debug this.
CPU: AMD Athlon X4 860K
GPU: Nvidia GTX 780
16 gigs of RAM, Windows 10.
I can play the season 1 missions fine, but the season 2 missions crash after attempting to start the level. Cheers, and thanks.