Hi,
it seems that replication fails if a new account gets mail before the user opens the mailbox
for the first time and creates the seen-db
At least in imap 2.3.0,
in function do_seen
r = seen_open(&m, user, 0, &seendb);
changing 0 into 1 seems to help
r = seen_open(&m, user, 1, &seendb);
regards
Wolfgang Hamann