Users are currently noting that manual saves are disappearing on versions of the game that include Windows PC, Xbox 360 and PlayStation 3, while older saves appear to have lost some data including already finished side-quests.
"We're aware of an issue that seems to be affecting some Thief players, preventing them from completing some levels," a Square Enix representative told us. "We're taking this very seriously - as a first step we're reading as many reports of the issue as possible, working to replicate it internally, so that we can understand what's causing it. We're sorry for any disruption to your game today, and we'll update you as soon as we have more information."
Thief received a 6 out of 10 review from Polygon when reviewed on Xbox One and PlayStation 4. "There are elements of a better game in Thief - maybe even a great one," it reads. "I enjoyed Garrett's adventure when it was about stealing, when it was about getting into a structure creatively and sneaking away, about accumulating and spending loot. But I wanted much more of that breaking and entering than it was willing to give me. Thief never quite pulls it together. Instead, too often, I felt like a mouse in a narrow hallway filled with cats."