Ubisoft is looking into a "rare" bug with the recently released Assassin's Creed 3 Hidden Secrets DLC which deletes save data. While you wait, please bear in mind community developer Gabe Graziani's advice about avoiding the problem.
"We're able to reproduce this issue at the studio and are working on a fix/workaround," he wrote (via VG247). "From what we can tell, this problem seems to be rare and should generally only affect a very small number of players. That said, we're taking the speedy and complete resolution of this very seriously.
"AVOIDING THIS BUG: Do not load your saved AC3 game while the DLC is downloading in the background. This appears to be the key trigger for this bug. You can do anything else you want to do, just don't load up your saved game and play it while the DLC is downloading."
Offering one hour of gameplay across three new levels, the Hidden Secrets DLC went out to Season Pass holders this week. Have you got it? What do you think?