[Dovecot] Purge / Delete Problem using IMAP

[A Ve]

Hi,

I am using dovecot 0.99.14 RPM on a Fedore Core 4 Server.

Everything was running fine for weeks (IMAP), and 2 days ago I was not
able to delete/purge any Mail in INBOX. I am using Outlook 2003 as an
IMAP-Client.

I tried to delete/purge the Inbox with other mail-clients (Mozilla
Thunderbird, Mulberry) too, same effect: I can read mail, I can copy them
by drag-n-drop to a local Client-Folder (eg: Outlook) , but I can delete
them.

Strange enough, the mails are marked as read, but when I login again, all
Mail are marked as new/unread !

When I log to the node, and start mutt (which is using the spool-file
/var/spool/mail/username), then I am able to read-n-delete all Mails...

The File Permisson of the File: 755, Owner: Username, Group: Mail.

Did I miss something ? How can this stop working from one day to another ?
I seems to me, like the INBOX is not writable to me ... From the UNIX
Side, it is ... :-/

Any Comment/Feedback would be helpfull. This is really strange.

Regards, AVE.