G'day

I am having an interesting issue,  that I can not find a fixe for.   

I am running dovecot 1.0 rc7, on a Freebsd 5.4 x86 box, with around 1500ish users, using Maildir storage format. I have a very small number of user, with the same problem, when messages are moved from ~username/Maildir/new to ~username/Maildir/cur a random number, of the files ownership, will change to root. And my users can then not download any mail until this has been fixed.

I  have an identical setup running on Solaris 10 x86,  that does not 

have this problem. Has anybody come across this before on Freebsd or any other operating system. Or have any suggestions, on what I can try to fix the problem. I have not been able to emulate it in a lab environment, and the logs on the server do not produce an error.