You can login there and it will register the user okay to the mysql database. Originally, the "activation" was set to "null". For some reason, when the user gets the welcome email, they click the link but it does not change the activate membership on the mysql side. It remains null. So just for a test, I set the default to "1" which will activate the account.
click on "signup.html" and it lets you create an account just fine. If you go to "login.html" it will let you login and gives the message just fine as well. The problem is when you don't enter your credentials correctly it just sits at a blank page. Here is the code:
$username = $_POST["username"];
$password = $_POST["password"];
$result = MYSQL_QUERY("SELECT * from users WHERE username='$username'and password='$password'")
or die ("Name and password not found or not matched");