Scott Baker - 2010-05-03

I have a Virtualmin GPL setup (CentOS 5 on EC2 cloud) that is having a strange error. Consistantly the same email account (one of over 200 on the server) is failing to continue to collect new messages. When one tries to access Usermin for this account there is an error" Invalid PID File - Failed to save mbox" if I update the account on the virtualmin side everything is fine again for a week or so and then the problem is back. - Any ideas?