dovecot - Nov 2012 - IMAP session state inconsistent

Running Dovecot 1.2.12 (we are in the process of upgrading to 2.1.x)

Didn't find much in old threads, but we are seeing the following in the 
logs this morning:

dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN, rip=x.x.x.x, 
lip=y.y.y.y
dovecot: IMAP(wajabrun): Disconnected: IMAP session state is 
inconsistent, please relogin. bytes=443/1146
dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN, rip=x.x.x.x, 
lip=y.y.y.y
dovecot: IMAP(wajabrun): Disconnected: IMAP session state is 
inconsistent, please relogin. bytes=561/1637
dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN, rip=x.x.x.x, 
lip=y.y.y.y
dovecot: IMAP(wajabrun): file_dotlock_open() failed with file 
/mail/w/a/wajabrun/Maildir/.INBOX.02 ORDERS.Gaiam/dovecot.index.log: No 
such file or directory
dovecot: IMAP(wajabrun): file_dotlock_open() failed with file 
/mail/w/a/wajabrun/Maildir/.INBOX.02 ORDERS.Gaiam/dovecot.index.log: No 
such file or directory

Not sure what to make of this sequence?

On 8.11.2012, at 16.45, list at airstreamcomm.net wrote:
> Running Dovecot 1.2.12 (we are in the process of upgrading to 2.1.x)
> 
> Didn't find much in old threads, but we are seeing the following in the
logs this morning:
> 
> dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN,
rip=x.x.x.x, lip=y.y.y.y
> dovecot: IMAP(wajabrun): Disconnected: IMAP session state is inconsistent,
please relogin. bytes=443/1146
> dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN,
rip=x.x.x.x, lip=y.y.y.y
> dovecot: IMAP(wajabrun): Disconnected: IMAP session state is inconsistent,
please relogin. bytes=561/1637
> dovecot: imap-login: Login: user=<wajabrun>, method=PLAIN,
rip=x.x.x.x, lip=y.y.y.y
> dovecot: IMAP(wajabrun): file_dotlock_open() failed with file
/mail/w/a/wajabrun/Maildir/.INBOX.02 ORDERS.Gaiam/dovecot.index.log: No such
file or directory
> dovecot: IMAP(wajabrun): file_dotlock_open() failed with file
/mail/w/a/wajabrun/Maildir/.INBOX.02 ORDERS.Gaiam/dovecot.index.log: No such
file or directory
> 
> Not sure what to make of this sequence?
Probably user deleted the mailbox while other sessions still had it opened.
There are some more checks to avoid those in newer versions.