The team have said they're hard at work with Microsoft to get out a version that "corrects the aforementioned freezing issue." They add their thanks to methodical fans for detailed feedback.
"Since The Pitt went back up on Xbox LIVE last Wednesday, we’ve received feedback that some folks were experiencing freezing issues while trying to access The Pitt. We’re working with Microsoft to get a version of The Pitt up that corrects the aforementioned freezing issue. Once the content is up and available, we’ll let you know," .
"We’d like to thank all our fans who generously and methodically reported what they were seeing on our official forums, via email and on this blog. This data was immensely helpful in tracking down these issues." Fortunately no such screw ups appear to have found their way into the PC version of the DLC.
This April will see the release of the third planned DLC, Broken Steel, which extends the game beyond its ending and raises the level cap. Better luck next time, eh?