Dovecot's log (mail_debug=yes) is clear. The error occurs systematically on a shared mbox with subfolders: selection of subfolders is ok, selection of the root shared folder triggers the error. the root shared folder does not contain any mail, which is a wanted feature.
On Fri, Aug 19, 2016 at 1:04 PM, Aki Tuomi <'aki.tu...@dovecot.fi'> wrote: On 19.08.2016 14:00, Ruga wrote: > Occasional error from TB when selecting a dovecot's shared mbox: > > "Unable to open the summary file for [shared]" > "Perhaps there was an error on disk, or the full path is too long." > > The server's disk is clear, and the longest full path is [a-zA-Z/.]{46}. > > The error occurs occasionally. Hi! Is there anything in your server's logfiles? Aki