Screen capture below shows some Subject lines populated, some not populated. All of them have titles int the ost_ticket_thread table.What I noticed though, is that the ost_ticket__cdata table is missing all tickets 2-745, but tickets 1 and 746-909 are present in this table.Seems like creating the Custom List somehow caused a bunch of deletions from the cdata table. Fortunately I have a backup, so for me this is resolved, though there does appear to be a significant bug when adding Custom Lists.