For those who may be having the same problem, I found a partial fix to this problem. Executing MOBKstat.exe does nothing UNTIL McAfee Online Backup performs a backup for the first time. After the first backup, executing MOBKstat.exe displays the status window for the last backup (or attempted backup). At the same time, the McAfee Online Backup tray icon is restored. However, the tray icon can subsequently disappear into the "Past Items" notifications. It may be brought back to an active icon by executing MOBKstat.exe again.