I’ve had an issue for several days now where my Ubuntu 10.10 based laptop would not sync to my Dropbox account. I felt as though I had one arm tied behind my back without a working dropbox. I reinstalled, relinked, and every other thing I could think of to redo.
Finally, I found this post in the dropbox forums: http://forums.dropbox.com/topic.php?id=32076&replies=4#post-284751
This will download and reinstall dropboxd on the machine. Once that happened, dropbox was once again happily syncing. Feels good to get that arm untied.