I can fix it checking the phpMyAdmin config file at "/usr/local/cwpsrv/var/services/pma/config.inc.php" (In my case the root password is empty)
/* Authentication type */
$cfg['Servers'][$i]['auth_type'] = 'cookie';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'TypeHereYourMysqlRootPassword';
If you dont know your mysql root password you can get it at "/root/.my.cnf" or "/usr/local/cwpsrv/htdocs/resources/admin/include/db_conn.php"
Good luck!