There's nothing available to you in this view of yumeko.doki's archive.
This is probably because:
- yumeko.doki didn't take any photos or video on 7th December 2009,
- The dates have been changed,
- Content has been deleted, or,
- You clicked on a 'posted on' date link from something private that you can only see because it is in the pool of a group that you belong to. (Private things don't show up in people's archives, except when you're looking at your own.)