Everyone be warned. If you start a sidequest make sure you finish it before you turn the game off. I started the Frontiersman quest UFO in Boston and had to shut down my game. When i returned to play the clue markers were gone and now i am no longer able to do ANY frontiersman missions. It shows the map marker for the missions but when you enter the pubs you can do nothing but play the pub games. I've tried quitting and exiting the game through the menu, shutting down the xbox. I even did the next main storyline and it still wont work. Do i restart the game at 55% complete and forget those missions? Nope. What a pisser.
I have spent a total of 38 hours so far playing this game and i am 84% complete, however for the Frontiersman Challenge solve the mystery of the UFO I believe this aspect to have a glitch. I know from posted videos the location of the UFO however it is not there, there are no clues and no green circle. I have spoken to everyone I believe to be frontiersman in Boston but still no luck. Anybody got any suggestions? I really need this to be resolved.
I am also having this issue. It is the only thing preventing me from getting 100% on the game. I logged a support ticket for it and they just sent me a canned response about fixing game freezing which has nothing to do with my issue.