We've never had issues before and have been using amember for a LONG time. Out of nowhere though our pages showed up blank.. How could this happen? Check out the display errors: http://singingsuccessonline.com/amember/member.php
Looks ok from here. Are you getting errors in your logs? What are the steps to reproduce your issue that you are seeing?
Can see page ok and it seems to be working as if you try logging in with random data it correctly reports incorrect username or password.