I just upgraded to 2.8.4, deleted old wp-admin and wp-includes and copied over new unzipped files, including the new wp-config.php file with my info. When finished, logged in and was asked to "upgrade database" which I did.
The blog looks good, but when I try to write a new post or edit, I get:
Fatal error: Call to undefined function: get_editable_user_ids() in
Insurance/provingground/wp-admin/edit-form-advanced.php on line 505
Can anyone tell me what I'm missing?