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Awesome, thanks for sharing how you fixed it! PM me if you need any more help ;)

public function doesUserExist($username) { global $db; $query = $db->query("SELECT null FROM users WHERE username = '" . $username . "'"); $rows = $query->num_rows; if($rows < 0) { return false; } return...

Are there any error_log files?

Does the registration put a user into the database? As you mentioned you were able to register and view a page as the user. This would only be possible if the 'me' page can pull session info from the database. If you are just unable to log in with an account, most likely your login script is...

There is nothing noticeable that could be wrong; as it was working completely fine earlier.

There are plenty of tutorials, but post what exactly your setup is currently for people to help you!