[BlueOnyx:08349] Active Monitor state changes - sends blank output

[Richard Morgan]

I've begun getting fairly meaningless Active Monitor emails recently:


Active Monitor has detected recent changes in the state of your server 
appliance.
For more details, please see the Active Monitor section of the Server 
Desktop.

Summary of changes:

*
-
-
-

These arrive every 15mins.  Is this a configuration mishap or is something 
actually wrong?  Any ideas would be appreciated.

Thanks, Richard