[Dovecot] error in 1.1.2

[Cor Bosman]

Ive been able to grab the dovecot.rawlog output of a few people with this
problem.. basically this is what I see with all of them:

Sep 10 13:43:13 userimap7.xs4all.nl dovecot: IMAP(xxxxxx): rename(/var/spool/mail/dovecot-control/indexes/c/co/xxxxxx/.Junk E-mail/dovecot.index.cache.lock, /var/spool/mail/dovecot-control/indexes/c/co/xxxxxx/.Junk E-mail/dovecot.index.cache) failed: No such file or directory
Sep 10 13:43:13 userimap7.xs4all.nl dovecot: IMAP(xxxxxx): file_dotlock_replace() failed with index cache file /var/spool/mail/dovecot-control/indexes/c/co/xxxxxx/.Junk E-mail/dovecot.index.cache: No such file or directory

da56 UID COPY 11078 "Junk E-mail"

And I see no result in the .out file, so the client waits for a result,
doesnt get it, and times out. 

I can also absolutely verify that if I take the NFS server out of the
equation completely I still get this problem. 

Cor