Comment 5 for bug 226851

As explained in the upstream bug report:

I had a similar problem. I fixed it by removing the two auto-created anonymous localhost
users. These had higher precedence in the MySQL user-matching ordering, because
'localhost' is more specific than '%'.

References:
Anonymous users are created by default:
http://dev.mysql.com/doc/refman/5.0/en/default-privileges.html

Order matching:
http://dev.mysql.com/doc/refman/5.0/en/connection-access.html
(It is a common misconception to think that, for a given username, all rows that
explicitly name that user are used first when the server attempts to find a match for the
connection. This is simply not true....)