I installed wordpress on my site (comutersponge.com) and everything was working fine. Then I used the wordpress secret key generator, and put the keys in the wp-config.php. Everything seemed to be working fine. But when I tried to register a test user, I would get a 500 internal server error after hitting the register button. After countless hours I discovered that if I delete the keys from the config file, registration works just fine. What should I do?