[Dovecot] Rogue child imap processes when using Mac imap clients

hi all-

I am currently running dovecot 0.99.10p2 on OpenBSD-3.4-snapshot. It has been very stable, but I have recently noticed that I am having problems when checking IMAP-SSL mail with Mac OS X clients. There are not problems using Mozilla or Outlook on Windows, but Mac clients (Thunderbird, Mozilla, Mail.app) all exhibit the same behavior - they can check and send mail, but I end up with a single, rogue child imap process on the server that pins the cpu that i have to 'kill -9' to clear out.

Is this a Mac problem or a Dovecot problem? I'm not even sure what to look for in the logs...

Thanks, Darren David