> So just to confirm, this virtual folder was working in < 2.2.21 but stopped > working afterwards?
Yes, selection of this folder with this dovecot-virtual content was working with 1:2.2.18-2+b1 but now segfaults dovecot-imapd 1:2.2.21-1. I just tested with 1:2.2.22-1 from unstable, I still have the crash. -- Sylvain