First of all I want to apologize for my English, I am using a translator. It is the first time I write in the forum, but I read Stella's page for quite some time and has been very helpful. I take 38% of the game completed, playing at a slow pace, as I like to complete each region to 100%. I have encountered a serious bug in the game, more precisely in the Soviet facilities, and that by continuing with the story without completing secondary missions allies Jacob, when I return to the area is impossible for me to reach certain sectors map, due to changes in buildings due to game action. I have tried different access points from the quick trip from the camps, but no way to access. Nor red laptops are to complete another challenge in the area. I installed the two update patches that are available, but have not been helpful to solve the problem. I'm afraid I'll have to play everything from the beginning and before continuing with the story, complete all side quests and challenges in the area to complete 100%. I hope it helps someone warning, not to lose many hours of play. Cheers from Argentina.