Bill, I'm not trying to give you a hard time, but 3 times you've seemed to miss the one thing above all that causes this error.
http://bugs.mysql.com/bug.php?id=20815Have you checked your MySQL server version yet against the versions known to have the bug that most commonly gives the errno 12 error? You answered with PHP version but is not MySQL server version.
Please check that as it is the most likely cause.