The erminig log says this after a sync attempt: "RequestError({'status': 400, 'body': 'Invalid UserID 0', 'reason': 'Bad R [...] If the solution to this problem is obvious to you I will not submit this as a bug report in bugzilla, but if this is a mystery let me know and I will make a bugzilla submission. [...]
$ sqlite3 erminig.db sqlite> select * from Profiles; sqlite> .quit