When did this behavior begin? I see you're running v7.6.2, and I'm sure you'd have noticed this issue from when you installed it (it was released on September 18th, 2018). Has this only started with the change of webhosts? Do they have a complete backup of your webspace prior to the migration to GoDaddy's servers?
The upgrade and owner change happened around the same time and immediately following that period I went away for a few months and had virtually nothing to do with the site.
Regarding the backup. I have no idea and really want no more to do with them. Yesterday they renamed the UBB cache folder and changed php.ini files then left the site in a mess.
Just a few days to set up the new site and I'll be free of them.
The backup from prior to the migration might be whats needed if the database is corrupted. None of the queries have been changed in these scripts for at least 10 years, if they're not working now I'd suspect database corruption might be the culprit.
In my case, the flat mode works but only when threaded mode is default.
To me, this seems that it is the logic rather than the data that is corrupted.
However for you, this is not the case.
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