Your advice about limiting admin access is probably a good idea.
"how is "Yes, all members are assigned to a group" not lying about them in fact not being in a group? The system reported that with the error logs you supplied."
You're not making any sense beating this dead horse.
What would I possibly gain by lying?
Before everything blew up everyone was assigned to a group.
As of three days ago there did not seem to be any problem.
that's the reason I'm here asking for help, because it all went south and I don't know what caused it. 15000+ members suddenly fell into a hole.