I had the same awful experience. I had finished Kunlun Mountains and turned off my PS3 to go to sleep and the next morning I booted up the game and loaded my save and had just started Tashgar when I had to stop. So I turned of my ps3 but when I came back about two hours later my save was gone. My only choice was to start over. On the Battlelog site my progress from the night before was clearly documented with score and everything but that info was not available in game.
So I started the game again played through the whole thing ( for once kind of grateful for its shortness) and I even replayed the last mission to get all the assignment medals. The next day I was disappointed to see that the replay mission option was gone... again..... and my only choice now is to play the whole story through again.... As before battlelog shows my stats correctly and the dogtags I had found are available in MP but it sucks that the game does not save the game correctly.
This is a pretty big bug and a disgrace to this fine franchise.
I will not recommend this game to my friends unless they are prepared to play the game through in one sitting until DICE gets up off their collective assess and fix this.
