I loved the game from the beginning...and then after playing it for about 4 hours I just got pi$$ed off. I received a new item to be used and thought that it would be good to fast travel back to other base camps (save points) to use this new item on things that it would affect that I did not have an item to use to affect it previously. Well, I fast traveled back to the previous base camp and was unable to do what I wanted to do so I attempted to travel back to the furthest base camp that I just came from...BUT IT WOULDN'T LET ME!!! I then attempted to restart the last checkpoint...but all the buggers that attacked me previously were still dead and, due to specific events that take place (that I thought would reset if I restarted the last checkpoint), I was unable to get to ANYWHERE that would allow me to travel back to the furthest checkpoint in the game.
Idiots designed this game to have a glitch that big. GTH.