1) Make sure you have cookies enabled on your browser. 2) Make sure SESSION.AUTO_START=1 in the PHP.INI file. 3) If you have 'LOGIN_CASE_INSENSITIVE' set 1 in your defines.php file (in includes directory) , you need to enter your password using the correct CASE. 4) If you have an older version of NOLA, 'LOGIN_CASE_INSENSITIVE' does not work when set to 1. Update, or change to 0.