You seem to have missed my point, when i used the term 'localhost' I wasnt mearly referring to the host name of your DB server. Paypal will only post back IPN validation data to servers it can actually connect to! thus if paypal can't see your server it cant give you POST variables, that was my point, you need to either fudge your router's firewall to allow traffic on port 80 or use a test web server externally hosted.

This may or may not be your problem, depending if your getting variables or not.

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mysql> SELECT * FROM `users` WHERE `users`.`clue` > 0;
Empty set (0.00 sec)