[Dovecot] "Corrupted index cache file" error (Dovecot 1.0.3)

Greetings -

Now that users are beginning to pile up more on our new Dovecot-based
IMAP service I'm seeing a small number of entries like this in the
logfiles:

Corrupted index cache file /mailstore/index/o/ozw100/.INBOX/ dovecot.index.cache : invalid record size

We are using Dovecot 1.0.3 with Maildir folders served over NFS from
NetApp filers, but the index files are stored on local disk.

By "a small number" I mean 4 or 5 on each of our two IMAP servers
since midnight.

• Should I be worried?
• Is there anything I need to do fix the files? (I'm guessing not
  as no problem reports have come in, and the logs show the people affected continuing to work throughout the day.)
• Would upgrading to 1.0.5 help? (I couldn't see anything in the Release Notes for either 1.0.4 or 1.0.5 about this)

Cheers, Mike B-)

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