Forza 5 restart bug

Hello i’m french, so i apologize for my bad english ;

Yesterday i did the update for the last DLC, and everything works very well I could continue my career.
But when i restart the game some hour later, the game start from the beginning, with top gear speach.
I try to clear cache, re download the game, remove my save from the console and pick up from the cloud, play offline,
but whenever i press A button from tittle screen, the game launch the beginning.
I don’t understand why, because on my HDD, my save game is still her (45,1Mo), so why i can’t pick up my data ?

Sorry to hear youve lost your save, Send heliosT10 a pm with game save issue as the title and details of problems your having.