I'm not exactly sure why, but either a new version of dropbox or iOS7 has disrupted Oovium's ability to cleanly work with dropbox.
Generally, everything still works. However, the first time connecting to dropbox, Oovium will not realize permission has been given and will send you back to dropbox to get it (again).
The work around is to force kill Oovium. After relaunching, Oovium rights itself and you'll be able to use dropbox normally.