Perhaps old remnant user groups? I know you're a long time user and I'm sure you account has been migrated to newer versions of SMF. Not sure how SMF works but I know in old versions of vB I was working with the permissions were there own table and there were than usergroups applied permissions, and than users affiliated with the groups, while the groups and users were all affiliated by incremental IDs which could (and did) get mixed up when migrating DBs. Probably not exact case here but if the button just isn't there, sounds like user permissions of some sort.