Today for one of my mailboxes RoundCube started to give an error while loading the list of emails (the unread counter is correct). Other mailboxes work fine with this installation.
This message is shown in RoundCube:
Server error: Unable to send command: A0005 FETCH 1:* (UID FLAGS BODY.PEEK[HEADER.FIELDS (SUBJECT)])
It is running on a Synology NAS DS 213 DSM 5.0 using Dovecot 1.2.0 and RoundCube 1.0.2.
In /var/log/dovecot you see the entry dovecot: May 28 22:59:19 Error: child 16875 (imap) killed with signal 11.
In the logs-directory of RoundCube no errors or log entries are to be found.
When I open the mailbox with Mozilla Thunderbird or MS Outlook 2010 the e-mail are loaded successfully and are accessible.
Can anybody tell me what is wrong?