Missing list of person's calendars

There is a known intermittent problem with missing names under the Person's Calendar in Outlook.  When you open another user's calendar, their name will automatically appear in the navigation pane.  If you sort this list or change it by moving a name up or down on the list, some or all of the names may disappear.  Currently there is not a fix available.  As soon as the problem is corrected, we will post.