A glitch in Thief halts progression

Kotaku reports that an issue in the fourth level of Thief apparently prevents players from progressing in the game after a recent update. Eidos Montreal offered the following statement:

"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".

Are you having issues with Thief?