[Snowhog]

I already disabled zbblock earlier -- it didn't make a difference, and I didn't believe it would. But it was an attempt to 'eliminate' zbblock as a possible cause.

The user 'had' a custom avatar. It isn't showing in his user profile now, as is the case with all our other members who had avatars. As I said, this issue is affecting everyone except for the members of the Administrators and Retired Administrators usergroups.

When I set the permissions on the ./images/avatars directory/sub-directory and ran the rebuild maintenance options, I saw lots of image files being updated -- in the database.

I guess I could execute the Move Items from Database into File System. I'll have to change the permissions on the ./customavatars and ./customprofilepics directories before doing so.