I had a thought (it almost hurt).
All the affected members belong to the Established Users usergroup, which is an Additional Usergroup. They have all the permissions necessary. But, they belong to the Registered Users usergroup which doesn't have the permissions to use avatars or profile pictures.
I was making changes to the Registered Users usergroup 'today', but of course, the issue we are having began a day or so ago.
Question: Do the more restrictive permissions of the Registered Users usergroup override those of the Additional Usergroup? I don't believe that is how vBulletin works, but I have to ask.
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