#7 Error in Swatch for Disk Usage

[Dogsbody]

I have now confirmed this error on more than one box.

When the Active Monitor/Swatch for Disk Usage triggers and turns amber the admin gets an error saying....

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:
* Disk usage is normal.

... and when disk usage really does return to normal the same message is mailed out again!?