[Dovecot] Dovecot 1.0.beta9, emails disappearing?

Hi, I've been using Dovecot successfully for a while and I've recently encountered an issue :

I got to work today and half the emails, were deleted... and after careful investigation :

• On Monday it seems, the emails magically vanished .. (what I've been told)
• My backup from Tuesday morning at 3am, indicates that all the files (mailbox) are intact but the subscription file is missing half the entries.
• At noon, on Tuesday, half the subscriptions are still missing and half the files now also missing.

Any ideas, known issues, suggestions?

Details : # dovecot --version 1.0.beta9 # uname -a NetBSD Z 3.0.1 NetBSD 3.0.1 (GENERIC.MPACPI) #0: Fri Aug 18 08:34:05 EDT 2006 m@Z:/usr/src/sys/arch/i386/compile/GENERIC.MPACPI i386

the server in question is usually just idling away... and nothing abnormal in my logs

thanks for your time, Martin