Drupal and jQuery Plugins (ie tools) - overlay - mask isn't working - suspect javascript issue
I had a similar problem where the overlay was displayed in IE7, no elements on the page displayed, including close button. All elements were behind the mask. Adding this in the overlay() settings solved the issue:

onLoad:  function() {
  this.getOverlay().insertAfter('#exposeMask');
}


now the login popup in my site riparotto works fine.