UPDATE:

Eidos devs have apparently solved the mystery of the disappearing saves that have cropped up recently in Thief . From the Eidos website:

"Thanks for being patient – we’re coming back to you after much overnight work and the good news is that we’ve identified the problem and we can fix it quickly.Basically, it’s an issue with the mathematical calculations of time-stamps from March 30th – April 2nd, which meant systems didn’t recognise the most recent time-stamp and instead took the previous time-stamp save (re-starting the level). So if you saved your game on March 30th, you may have experienced a disruption yesterday on April 1st and if you saved your game on March 31st, you may have experienced disruption yesterday April 1st and today April 2nd.After today the calculations are accurate and there should be no other issues. We are working on a patch to ensure this doesn’t happen next year with these March/April calculations.Also, your saved games should not be corrupted, and after today April 2nd, no one should experience this. Note: it is possible that you may need to restart the chapter you were on, but progress will then be saved as normal. Obviously we will keep monitoring the forums for any updates from you, we’re reading what’s being posted here and once again we are very sorry for any disruption to your game."Original story is below.

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Square Enix is investigating numerous claims of game-corrupting save bugs in Thief, over a month since its launch on February 25.A number of players have noticed that their Thief saves have disappeared or been corrupted on PC, PS4 and Xbox One versions of the game. According to Steam users , the issues can be fixed on Windows 7 machines by setting the date ahead to April 2, but no fixes have been reported otherwise."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 Game Informer . “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."Have any of you noticed the issue? Let us know in the comments.

Lucy O'Brien is Entertainment Editor at IGN AU. Follow her ramblings on IGN or Twitter.