I've been using daedelus since buying a couple of days ago and it has crashed twice with loss of data upon reopening and I am getting the dropbox 'error 404' on some stacks but not others. I really like it but confidence is diminished.
Looks like people using notebooks app are having the same problem. And people are attributing the dropbox fail with the filing structure.. http://forums.dropbox.com/topic.php?id=25908