I’ve had a few questions about this one. In the Refresh 4 image we have SharePoint 2010, SQL 2008 R2 running on Windows 208 R2 and so when a Role Center loads that contains the KPI or Business Overview Webpart you will get this script error.
If you click yes the page will still load. It’s annoyance but otherwise the page will load.
You might also want to turn off the page reload that is in Tools\Options for the user you are using.
The sustained engineering team (SE) are looking into it but because it is just an annoying message no ETA.
(Original blogs http://blogs.msdn.com/lcash)