Bethesda has replaced another faulty version of The Pitt on Xbox Live Marketplace, according to the developer's blog.
Those who had the Fallout 3 content and were experiencing crashes need to delete the existing content and re-download. Those unaffected need do nothing.
To delete The Pitt content, head to the Memory option within the System Settings part of the Xbox 360 dashboard Settings menu. Once there, scroll down and find Fallout 3, select, and then confirm deletion of The Pitt.
The Pitt was released last Tuesday but soon removed as the Xbox Live Marketplace file was corrupted. No sooner was this fixed than the latest bout of crash-related problems arose.
Nevertheless, The Pitt - which costs 800 MSP (GBP 6.80 / EUR 9.60) - is a worthwhile purchase (like myself) and offers considerably more value than Operation: Anchorage - the first of the Fallout 3 DLC.