[Scott MacVicar]

check this stage again

on line 45 and 59 change
if (!$perms[ismoderator] and !$ismod=$DB_site->query_first("SELECT * FROM moderator WHERE userid=$bbuserinfo[userid] AND (canbanusers=1 OR canviewprofile=1)")) {
to
if (!$perms[ismoderator] and !$ismod=$DB_site->query_first("SELECT * FROM moderator WHERE userid=$bbuserinfo[userid] AND (canbanusers=1 OR canviewprofile=1 OR caneditaccess=1)")) {

thats the only part that would cause an error, either that or the mods don't have permission to edit access masks for that forum.