I got my whole company to switch to dropbox 4 and now we each have a personal primary vault and several shared team vaults for different teams. It works great! (Well, mostly.)
The problem that I'm having is that when I try to open iOS app and tell it to connect to dropbox it automatically finds and picks one of the team vaults rather than my personal vault. I dont see any way to select my default vault, or to add / switch vaults. I've tried re-installing, turning on or off icloud sync, and several other combinations of options. No luck.
The vault that it is selecting is not the one in the default location of Dropbox even, its in a subfolder so I'm not sure why its selecting that one.