[Dovecot] errors while testing with imaptest

I get lots of these (in error log):

dovecot: Apr 28 14:50:03 Error: IMAP(jenslt): Corrupted index cache file /home0/jenslt/.imap/INBOX/dovecot.index.cache: record points outside file

And some of these: dovecot: Apr 28 14:50:03 Error: IMAP(jenslt): Corrupted index cache file /home0/jenslt/.imap/INBOX/dovecot.index.cache: field index too large (2037149797 >= 19)

Should I worry or not? (Assuming its not due to me having broken imaptest).

This was with command: imaptest jenslt@xxxx:yyy pass=xxxx clients=40 msgs=300

Local software raid 5 on linux 2.6.16.11 on reiserfs.

Cheers, Jens

 'Old C programmers don't die ... they're just cast into void*'

 Jens Låås                              Email: jens.laas@data.slu.se
 Department of Computer Services, SLU   Phone: +46 18 67 35 15
 Vindbrovägen 1
 P.O. Box 7079
 S-750 07 Uppsala
 SWEDEN