Hey
Did you check that the timestamp also really changes in the server
Dovecot was running on? Could be a NFS caching problem.
It took a few seconds until the new timestamp came up on the dovecot-server, but it still didn't work after the new timestamp was available. I still got the message that there are 0 messages available even there are some mails in the cur/new dir...
The timestamp on the dovecot.index and dovecot.index.log file has changed after I attempted to log in.
The only solution at the moment is, to destroy the dovecot.index file. Unfortunately this is not a long-term solution for us, because it happens periodically and we don't know exactly which users are affected by this problem.
Any other ideas? Is there a possibility to check end rebuild the dovecot.index file manually?
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