This is ridiculous Telltale. I finally fixed my saved game issue try this if you are having an issue. Make sure to start a new game on which ever episode you left on, then do the timestamp thing.
Once I fixed it I was excited and clicked on play on episode 5. When I clicked it the screen went black and nothing happened. The game crashed. When I went back to restart the game, it reset my pref.prop file AGAIN! This means I have to go back and do the timestamp fix AGAIN!
Please fix it Telltale. Your "make sure there isn't another pref.prop" fix is not helping anyone.