The dashboard loses its data on server restart. Could this be the reason it's not showing that number? Did you restart before checking the dashboard? If so then unfortunately that data gets lost.
If this is what occurred I can see us possibly dumping this data to a file that can be read back in when the server gets restarted, persisting this information.
Matt Petty
Senior Software Developer
SmarterTools Inc.
www.smartertools.com