Tried making a simple, one-line change to admin-functions.php (to change thumbnail size) and it screwed the goose. The thumbnails didnt change, and now when I try to log-in to site admin I get the following error:
Fatal error: Cannot redeclare check_admin_referer() (previously declared in /home/yaddayadda/public_html/wp-includes/pluggable.php:227) in /home/yaddayadda/public_html/wp-admin/admin-functions.php on line 468
Yet we already reloaded original, unmolested admin-functions.php file and it still ain't working? Help??