When clicking on "Download Raw Diff" in the Diffusion, I see the following error:
Unhandled Exception ("PhabricatorDataNotAttachedException")
Attempting to access attached data on DifferentialChangeset (via getDiff()), but the data is not actually attached. Before accessing attachable data on an object, you must load and attach it.
Data is normally attached by calling the corresponding needX() method on the Query class when the object is loaded. You can also call the corresponding attachX() method explicitly.
Saw this on TOT as of 5 mins ago. Error persists through server restarts.