inaccessible mailbox for one user

[Lists Nethead]

Quoting Lists Nethead <lists at nethead.se>:

>> Hi,
>>
>> A user clicks on a mail in Horde IMP and next the inbox appears  
>> completely empty. This message files all still there of course, but  
>> the problem is that I cannot run any cyrus command on that mailbox,  
>> reconstruct, chk_cyrus or anything.
>>
>> Is there a lock possibly sitting somewhere that prohibits running  
>> any commands? Any other hints as to where I should start?
>>

Restored users seen and sub files from backup, ran reconstruct again  
and then I had to run unexpunge. Now user files are back but I see the  
following error for this user in the logs

IOERROR: conversations_audit on store

Should I try sbin/ctl_conversationsdb -b ?