Square Enix says it's investigating a Thief bug that's corrupting save data for some players.
Square Enix said in a statement issued to the site. "We're aware of an issue that seems to be affecting some Thief players, preventing them from completing some levels.
"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."
In our Thief review, we said the game "doesn't deliver on all of its swagbag of stolen promises, but still outshines many new-gen titles". See what other critics though of the game in our Thief review round-up.