I'm having a similar problem after talking confronting Chuck after he talked to Clem and him telling Lee that he needed to teach Clem how to defend herself/etc.
I talk to Kenny in the train's cab and try to access the maps but he keeps telling me to go away, so I exit the cab and try to heads toward the boxcar but as soon as I see Ben leaned over the railing and Lee closes the door behind him the game's camera goes below the ground and all you can see are trees in the game's skybox. If I move around the analog stick around some then Lee automatically goes back into the cab with Kenny.
Also there's a spot while in the cab where the outside of the train blocks the camera and you cannot see anything in the cab unless you move Lee behind Kenny.
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