Possible Solution (XBOX)
I had this problem for about a week - couldnt load my save game. On a recent update I saw that the save game file space was being increased and it made me wonder if my inability to load was due to my save game space being used. When I clicked on continue, I realised that I had ALOT of saved games in the list. I just went to the bottom of the list and started deleting them all, until about only five saved game files remained. Tried continue and it loaded !!
Im back in the game and making sure I dont have alot of save game files.
I dont know if this IS the answer, but its the only thing I have done and since I can load games.
Good luck, and I hope this helps some other gamers who are stuck get back in