Since I have upgraded to phpMyAdmin-2.7.0-pl1 I can't drop a user using phpMyAdmin. This is because phpMyAdmin-2.70-pl1 is using a other method then phpMyAdmin-2.6.4-pl4.
New method:
DROP USER 'hfh'@ 'localhost';
MySQL retourneerde:
#1268 - Can't drop one or more of the requested users...