I use Dropbox Passwords on 4 devices. My iPhone and my 'old' Macbook Pro, where everything syncs and works, and my iPad and my new Macbook Pro, where nothing is synced. Both just show me the 'Start adding accounts' screen. I've been through a looong list of measures with chat support, but nothing has solved this so far. Has anybody else experienced something similar? And maybe even found a potential solution?