Notifications icon is missing

Summary

The Notifications/workbox icon is missing from fresh installs of Confluence 6.6.6

Environment

• Confluence 6.6.6

Steps to Reproduce

1. Install Confluence 6.6

Expected Results

The notification icon will be seen

Actual Results

The notification icon is missing

Workaround

Add the following to the HEAD section in Custom HTML.

<script type="text/javascript">
    $(function(){
        $('#header .aui-iconfont-notification').addClass('aui-iconfont-workbox-empty');
    });
</script>