Today I noticed that my passwords on Mac, iPhone, and iPad weren't in sync. iPone and iPad showed "Dropbox sync failed to obtain list of remote data objects." The Mac version of 1P showed that the keychain was last synched 13 days ago.
After some fiddling on the Mac, the keychain on dropbox was updated. IPhone and iPad did an automatic sync. Out of curiosity I tapped "Sync Now" — and get now again the above stated message.
Reading all the recent entries about dropbox weirdness and issues it looks to me as if dropbox changed something on their side. Any suggestions how to get dropbox sync reliable again?