From the PerformancePoint Server 2007 SP1 Monitoring readme which you can download here
PerformancePoint Monitoring Readme
Effective Date: June 6, 2008
This file contains important information that was not available when the documentation for the product was written. Workarounds, when they are available, are provided for known issues.
The content in this Readme file applies to the PerformancePoint Monitoring components of Microsoft Office PerformancePoint Server 2007 with Service Pack 1 (SP1). These include:
· PerformancePoint Monitoring Server
· PerformancePoint Dashboard Designer
· PerformancePoint Dashboard Viewer for SharePoint Services.