When the Views Sexy Throbber module is used to easily set-up a custom loading icon with overlay, this new CSS in views-admin.theme.css sets the throbber display to none, blocking the loading animation.

/* Hide the drupal system throbber image */
.ajax-progress .throbber {
display: none;
}

.ajax-progress-throbber {
background-color: #232323;
background-image: url("../images/loading-small.gif");
background-position: center center;
background-repeat: no-repeat;
-moz-border-radius: 7px;
-webkit-border-radius: 7px;
border-radius: 7px;
height: 24px;
opacity: .9;
padding: 4px;
width: 24px;
}

Is there a setting somewhere that can disable this or am I going to have to edit this css file everytime I update Views?