The recently released ‘Hidden Secrets’ DLC for Assassin’s Creed III has arrived with a bug which has caused some players to lose their Assassin’s Creed 3 save data.

Ubisoft is working on the issue – which has affected both Xbox 360 and PS3 players – and has resulted in the loss of main mission or side mission data.

The community developer at Ubisoft Montreal, Gabe Graziani, is advising players not to load their saved game while the DLC is downloading.

“Just a quick heads up, we’re able to reproduce this issue at the studio and are working on a fix/workaround,” he said via the official forums.

“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.”