[Dovecot] rc23 Problem - Assertion Failed

[chandler.lists at chapman.edu]

Feb 27 14:17:46 wurfel dovecot: imap-login: Login: user=<USER>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
Feb 27 14:17:46 wurfel dovecot: IMAP(USER): file mbox-sync-update.c: line
387 (mbox_sync_update_header): assertion failed: (ctx->mail.uid != 0 ||
ctx->pseudo)


This is happening for dozens of users.  Anyone have a suggestion of what
to adjust?  It was happening somewhat less frequently in RC22, and I
believe the line number was in the 4hundreds there...