[Dovecot] Shared mailboxes do not support subfolders

[Frank Cusack]

On December 29, 2009 12:06:06 AM +0100 Nick Rosier <nick+dovecot at bunbun.be> 
wrote:
> Shared as in user-shared mailboxes. I think it was a mailclient (TB)
> problem. After subscribing from webmail (roundcube) I'm able  to see
> them. I will do some more testing to see if I can reproduce.

Did you read the bottom of <http://wiki.dovecot.org/ACL>?  Maybe the
dovecot-acl-list file needed to be refreshed and somehow this happened.