There still seems to be a small issue in the way fanfiction.net metadata is parsed for single-chapter stories; both in-progress and completed stories with one chapter (such as the one below) fail with an error:
http://www.fanfiction.net/s/5038877/1/
'NoneType' object has no attribute 'date'
If it is completed and not in the library, it will retrieve the story, but does not populate the Updated date.
ETA: I did not test in progress and not in the library.