Your recent updates to the iPhone app are a huge pain. Most of the changes reek of simply having been made for the sake of having an update. "Look! Changes!" Changes aren't always improvements. Why do we need this useless Home screen? Just open the app straight on Recents! And why on earth, when I tap on a file, do I get a preview screen of the file and an "open" button? Just open the file! All you've done is necessitate extra taps to accomplish what I used to accomplish with fewer. An improvement I'd like to see is to undo these changes and go back to how it was.
The one change that I DO appreciate: When I play an audio file in Dropbox, I can now jump 15 seconds backward or forward with those little circular arrows. Much better than having to mash a "fast forward" button, like in the days of cassette tapes.