<form name="login" action="<?php echo LOGIN_URL; ?>?redirect=<?php echo WB_URL; echo'/pages/'; echo 'members-area.php';?>" method="post">
Try:
<form name="login" action="<?php echo LOGIN_URL.'?redirect='.WB_URL.'/pages/members-area.php'; ?>" method="post">
instead
Remember to have a space between " and method!!
Have fun,
John