DTPO 2.3.1:»Synch with Dropbox«

What does this error message mean?

May I use this DB anymore?
Thank you.

Now I have some

as well.

Of course I tested my db before I started to sync and DTPO couldn’t find anything to nag.

The long expected Dropbox sync seems to be quite useless, right?
Or is there a recommended workaround?