I'm running the steam version 1.03 and am also running into the loading bug for this quest. Both the chase and the room inspection branches end in the same infinite loading screen. Loaded a previous save, logged another 8 or so hours before attempting again and still got the same result. Unfortunate that this came to light on a 3-day weekend for me, and it's a pretty big bug when looking at it from a story stance. But....I am glad I still have a "few" side quests to keep me busy. It would still be nice to have this addressed asap...I'm loving the story and this quest is no exception.
One thing I have not tried is downgrading to the initial release version, but I'm not sure if the steam version is has the capability. If anyone knows how I'd be happy to test. I'm assuming the reviewers did this quest on their early version. I do know they were on console versions, but it's a theory anyways.